Security Fix: The server crashed for assignment of values of types other than Geometry to items of type GeometryCollection (MultiPoint, MultiCurve, MultiSurface). Now the server checks the field type and fails with bad geometry value if it detects incorrect parameters. (Bug#55531)

Security Fix: EXPLAIN EXTENDED caused a server crash with some prepared statements. (Bug#54494)

Security Fix: In prepared-statement mode, EXPLAIN for a SELECT from a derived table caused a server crash. (Bug#54488)

InnoDB Storage Engine: InnoDB incorrectly reported an error when a cascading foreign key constraint deleted more than 250 rows. (Bug#57255)

InnoDB Storage Engine: A SELECT ... FOR UPDATE statement affecting a range of rows in an InnoDB table could cause a crash in the debug version of the server. (Bug#56716)

InnoDB Storage Engine: Improved the performance of UPDATE operations on InnoDB tables, when only non-indexed columns are changed. (Bug#56340)

InnoDB Storage Engine: The server could crash on shutdown, if started with --innodb-use-system-malloc=0. (Bug#55627)

InnoDB Storage Engine: For an InnoDB table with an auto-increment column, the server could crash if the first statement that references the table after a server restart is a SHOW CREATE TABLE statement. (Bug#55277)

InnoDB Storage Engine: Setting the PACK_KEYS=0 table option for an InnoDB table prevented new indexes from being added to the table. (Bug#54606)

InnoDB Storage Engine: Changed the locking mechanism for the InnoDB data dictionary during ROLLBACK operations, to improve concurrency for REPLACE statements. (Bug#54538)

InnoDB Storage Engine: InnoDB transactions could be incorrectly committed during recovery, rather than rolled back, if the server crashed and was restarted after performing ALTER TABLE...ADD PRIMARY KEY on an InnoDB table, or some other operation that involves copying the entire table. (Bug#53756)

Partitioning: Replication: Attempting to execute LOAD DATA on a partitioned MyISAM table while using statement-based logging mode caused the master to hang or crash. (Bug#51851)

Partitioning: Multi-table UPDATE statements involving a partitioned MyISAM table could cause this table to become corrupted. Not all tables affected by the UPDATE needed to be partitioned for this issue to be observed. (Bug#55458)

Partitioning: EXPLAIN PARTITIONS returned bad estimates for range queries on partitioned MyISAM tables. In addition, values in the rows column of EXPLAIN PARTITIONS output did not take partition pruning into account. (Bug#53806, Bug#46754)

Replication: Backticks used to enclose idenitfiers for savepoints were not preserved in the binary log, which could lead to replication failure when the identifier, stripped of backticks, could be misinterpreted, causing a syntax or other error.

This could cause problems with MySQL application programs making use of generated savepoint IDs. If, for instance, java.sql.Connection.setSavepoint() is called without any parameters, Connector/J automatically generates a savepoint identifier consisting of a string of hexadecimal digits 0-F encased in backtick (`) characters. If such an ID took the form `NeN` (where N represents a string of the decimal digits 0-9, and e is a literal uppercase or lowercase “E” character). Removing the backticks when writing the identifier into the binary log left behind a substring which the slave MySQL server tried to interpret as a floating point number, rather than as an identifier. The resulting syntax error caused loss of replication. (Bug#55961)

See also Bug#55962.

Memory leaks detected by Valgrind were corrected. (Bug#56709)

If a query specified a DATE or DATETIME value in a format different from 'YYYY-MM-DD HH:MM:SS', a greater-than-or-equal (>=) condition matched only greater-than values in an indexed TIMESTAMP column. (Bug#55779)

If there was an active SELECT statement, an error arising during trigger execution could cause a server crash. (Bug#55421)

With an UPDATE IGNORE statement including a subquery that was evaluated using a temporary table, an error transferring the data from the temporary was ignored, causing an assertion to be raised. (Bug#54543)

Row subqueries producing no rows were not handled as UNKNOWN values in row comparison expressions. (Bug#54190)

The max_length metadata value of MEDIUMBLOB types was reported as 1 byte greater than the correct value. (Bug#53296)

In some cases, when the left part of a NOT IN subquery predicate was a row and contained NULL values, the query result was incorrect. (Bug#51070)

For some queries, the optimizer produced incorrect results using the Index Merge access method with InnoDB tables. (Bug#50402)

EXPLAIN produced an incorrect rows value for queries evaluated using an index scan and that included LIMIT, GROUP BY, and ORDER BY on a computed column. (Bug#50394)

mysql_store_result() and mysql_use_result() are not for use with prepared statements and are not intended to be called following mysql_stmt_execute(), but failed to return an error when invoked that way. (Bug#47485)

Using REPAIR TABLE table USE_FRM on a MERGE table caused the server to crash. (Bug#46339)

A malformed packet sent by the server when the query cache was in use resulted in lost-connection errors. (Bug#42503)

CREATE TABLE failed if a column referred to in an index definition and foreign key definition was in different lettercases in the two definitions. (Bug#39932)

InnoDB Plugin has been upgraded to version 1.0.12. This version is considered of General Availability (GA) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

Security Fix: During evaluation of arguments to extreme-value functions (such as LEAST() and GREATEST()), type errors did not propagate properly, causing the server to crash. (Bug#55826, CVE-2010-3833)

Security Fix: The server could crash after materializing a derived table that required a temporary table for grouping. (Bug#55568, CVE-2010-3834)

Security Fix: A user-variable assignment expression that is evaluated in a logical expression context can be precalculated in a temporary table for GROUP BY. However, when the expression value is used after creation of the temporary table, it was re-evaluated, not read from the table and a server crash resulted. (Bug#55564, CVE-2010-3835)

Security Fix: The CONVERT_TZ() function crashed the server when the timezone argument was an empty SET column value. (Bug#55424)

Security Fix: Pre-evaluation of LIKE predicates during view preparation could cause a server crash. (Bug#54568, CVE-2010-3836)

Security Fix: GROUP_CONCAT() and WITH ROLLUP together could cause a server crash. (Bug#54476, CVE-2010-3837)

Security Fix: Queries could cause a server crash if the GREATEST() or LEAST() function had a mixed list of numeric and LONGBLOB arguments, and the result of such a function was processed using an intermediate temporary table. (Bug#54461, CVE-2010-3838)

Security Fix: Queries with nested joins could cause an infinite loop in the server when used from stored procedures and prepared statements. (Bug#53544, CVE-2010-3839)

Security Fix: The PolyFromWKB() function could crash the server when improper WKB data was passed to the function. (Bug#51875, CVE-2010-3840)

Incompatible Change: Replication: As of MySQL 5.5.6, handling of CREATE TABLE IF NOT EXISTS ... SELECT statements has been changed for the case that the destination table already exists:

This change in handling of IF NOT EXISTS results in an incompatibility for statement-based replication from a MySQL 5.1 master with the original behavior and a MySQL 5.5 slave with the new behavior. Suppose that CREATE TABLE IF NOT EXISTS ... SELECT is executed on the master and the destination table exists. The result is that rows are inserted on the master but not on the slave. (Row-based replication does not have this problem.)

To address this issue, statement-based binary logging for CREATE TABLE IF NOT EXISTS ... SELECT is changed in MySQL 5.1 as of 5.1.51:

This change provides forward compatibility for statement-based replication from MySQL 5.1 to 5.5 because when the destination table exists, the rows will be inserted on both the master and slave. To take advantage of this compatibility measure, the 5.1 server must be at least 5.1.51 and the 5.5 server must be at least 5.5.6.

To upgrade an existing 5.1-to-5.5 replication scenario, upgrade the master first to 5.1.51 or higher. Note that this differs from the usual replication upgrade advice of upgrading the slave first.

A workaround for applications that wish to achieve the original effect (rows inserted regardless of whether the destination table exists) is to use CREATE TABLE IF NOT EXISTS and INSERT ... SELECT statements rather than CREATE TABLE IF NOT EXISTS ... SELECT statements.

Along with the change just described, the following related change was made: Previously, if an existing view was named as the destination table for CREATE TABLE IF NOT EXISTS ... SELECT, rows were inserted into the underlying base table and the statement was written to the binary log. As of MySQL 5.1.51 and 5.5.6, nothing is inserted or logged. (Bug#47442, Bug#47132, Bug#48814, Bug#49494)

Incompatible Change: Previously, if you flushed the logs using FLUSH LOGS or mysqladmin flush-logs and mysqld was writing the error log to a file (for example, if it was started with the --log-error option), it renamed the current log file with the suffix -old, then created a new empty log file. This had the problem that a second log-flushing operation thus caused the original error log file to be lost unless you saved it under a different name. For example, you could use the following commands to save the file:

shell> mysqladmin flush-logs
shell> mv host_name.err-old backup-directory

To avoid the preceding file-loss problem, renaming no longer occurs. The server merely closes and reopens the log file. To rename the file, you can do so manually before flushing. Then flushing the logs reopens a new file with the original file name. For example, you can rename the file and create a new one using the following commands:

shell> mv host_name.err host_name.err-old
shell> mysqladmin flush-logs
shell> mv host_name.err-old backup-directory

(Bug#29751)

InnoDB Storage Engine: When MySQL was restarted after a crash with the option innodb_force_recovery=6, certain queries against InnoDB tables could fail, depending on WHERE or ORDER BY clauses.

Usually in such a disaster recovery situation, you dump the entire table using a query without these clauses. During advanced troubleshooting, you might use queries with these clauses to diagnose the position of the corrupted data, or to recover data following the corrupted part. (Bug#55832)

InnoDB Storage Engine: The CHECK TABLE command could cause a time-consuming verification of the InnoDB adaptive hash index memory structure. Now this extra checking is only performed in binaries built for debugging. (Bug#55716)

InnoDB Storage Engine: A heavy workload with a large number of threads could cause a crash in the debug version of the server. (Bug#55699)

InnoDB Storage Engine: If the server crashed during a RENAME TABLE operation on an InnoDB table, subsequent crash recovery could fail. This problem could also affect an ALTER TABLE statement that caused a rename operation internally. (Bug#55027)

Partitioning: When the storage engine used to create a partitioned table was disabled, attempting to drop the table caused the server to crash. (Bug#46086)

If a view was named as the destination table for CREATE TABLE ... SELECT, the server produced a warning whether or not IF NOT EXISTS was used. Now it produces a warning only when IF NOT EXISTS is used, and an error otherwise. (Bug#55777)

After the fix for Bug#39653, the shortest available secondary index was used for full table scans. The primary clustered key was used only if no secondary index could be used. However, when the chosen secondary index includes all columns of the table being scanned, it is better to use the primary index because the amount of data to scan is the same but the primary index is clustered. This is now taken into account. (Bug#55656)

The server was not checking for errors generated during the execution of Item::val_xxx() methods when copying data to a group, order, or distinct temp table's row. (Bug#55580)

ORDER BY clauses that included user variable expressions could cause a debug assertion to be raised. (Bug#55565)

Assignment of InnoDB scalar subquery results to a variable resulted in unexpected S locks in READ COMMITTED transation isolation level. (Bug#55382)

Queries involving predicates of the form const NOT BETWEEN not_indexed_column AND indexed_column could return incorrect data due to incorrect handling by the range optimizer. (Bug#54802)

MIN() or MAX() with a subquery argument could raise a debug assertion for debug builds or return incorrect data for nondebug builds. (Bug#54465)

INFORMATION_SCHEMA plugins with no deinit() method resulted in a memory leak. (Bug#54253)

After ALTER TABLE was used on a temporary transactional table locked by LOCK TABLES, any later attempts to execute LOCK TABLES or UNLOCK TABLES caused a server crash. (Bug#54117)

INSERT IGNORE INTO ... SELECT statements could cause a debug assertion to be raised. (Bug#54106)

INFORMATION_SCHEMA.COLUMNS reported incorrect precision for BIGINT UNSIGNED columns. (Bug#53814)

The fix for Bug#30234 caused the server to reject the DELETE tbl_name.* ... Access compatibility syntax for multiple-table DELETE statements. (Bug#53034)

XA START had a race condition that could cause a server crash. (Bug#51855)

Enumeration plugin variables were subject to a type casting error, causing inconsistent results between different platforms. (Bug#42144)

A PKG install on Solaris put some files in incorrect locations. (Bug#31058)

Problems in the atomic operations implementation could lead to server crashes. (Bug#22320, Bug#52261)

This is the final release of MySQL 5.1 for which Generic Linux MySQL binary packages built with the icc compiler on x86 and x86_64 will be offered. These were previously produced as an alternative to our main packages built using gcc, as they provided noticeable performance benefits. In recent times the performance differences have diminished and build and runtime problems have surfaced, thus it is no longer viable to continue producing them.

We continue to use the icc compiler to produce our distribution-specific RPM packages on ia64.

InnoDB Plugin has been upgraded to version 1.0.11. This version is considered of General Availability (GA) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), generic Linux RPM packages, and any builds produced with the icc compiler. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

Security Fix: Replication: It was possible when using statement-based replication to subvert the MySQL privilege system on a slave with a higher server release version number than that of the master by using version-specific comments in statements run on the master.

A more detailed explanation follows:

In MySQL, a version-specific comment is an SQL comment of the form /*!nnnnn sql */ where nnnnn represents a MySQL release version number and sql represents a string of SQL, or a portion of a string of SQL, that should be executed by the MySQL Server only if the server version is at least version n.nn. (For additional information and an example, see Section 8.6, “Comment Syntax”.)

In MySQL replication, the slave SQL thread executes with the SUPER privilege, regardless of the privileges with which statements are originally executed on the master. Specific to this issue, when using statement-based replication it was possible, when the slave was of a higher MySQL version than the master, to run statements that would have failed on the master due to insufficient privileges, except that these statements were wrapped in version-specific comments where the encoded version was greater than the MySQL server version of the master. However, if the MySQL release version of the slave was equal to or greater than the version encoded in the comment, the same statements could execute on this slave whose MySQL release version was less than the version number used in the comment.

Suppose that a master running MySQL 5.1.48 replicated to a slave running MySQL 4.1.49, and that a user user1 had privileges to run UPDATE statements on database db1 but no privileges at all on the mysql system database, so that the first of the following two statements succeeded, but the second statement failed, and thus the first statement was written to the binary log, but the second statement was not:

      
UPDATE db1.tb1 SET db1.tbl1.col1=2;
 
UPDATE mysql.user SET mysql.user.Super_priv='Y' 
    WHERE mysql.user.User='user1';

However, the text of the second statement could be wrapped in version-specific comments and thus “hidden” within the text of the first statement so that this new version of the first statement succeeded, and was written in its entireity to the binary log. The new statement containing the necessary portions of the statement affecting the “mysql.user” table wrapped within version-specific comments is shown here:

UPDATE db1.tbl1 /*!514900 ,mysql.user */ 
    SET db1.tbl1.col1=2 /*!514900 ,mysql.user.Super_priv='Y'
    WHERE mysql.user.User='user1'*/;

Thus, a 5.1.48 master would see this statement as identical to the first of the original two statements shown previously (UPDATE db1.tb1 SET db1.tbl1.col1=2). However, the version-specific comments within the statement just shown, when run on the MySQL 5.1.49 slave, were ignored; thus the slave SQL thread would execute the statement, as shown here, with the SUPER privilege, on the slave:

      
UPDATE db1.tbl1,mysql.user 
    SET db1.tbl1.col1=2,mysql.user.Super_priv='Y'
    WHERE mysql.user.User='user1';

To fix this issue, the ! (exclamation) character is now stripped from comments prior to statements containing them being applied on replication slaves; thus, version-specific comments that are not applied on the master are treated as normal comments on the slave and also not applied there. (Bug#49124)

Important Change: Replication: The LOAD DATA INFILE statement is now considered unsafe for statement-based replication. When using statement-based logging mode, the statement now produces a warning; when using mixed-format logging, the statement is made using the row-based format. (Bug#34283)

InnoDB Storage Engine: The server could crash on shutdown, if started with --innodb-use-system-malloc=0. (Bug#55581)

InnoDB Storage Engine: The database server could crash when renaming a table that had active transactions. (This issue only affected the database server when built for debugging.) (Bug#54453)

InnoDB Storage Engine: The server could crash during the recovery phase of startup, if it previously crashed while inserting BLOB or other large columns that use off-page storage into an InnoDB table created with ROW_FORMAT=REDUNDANT or ROW_FORMAT=COMPACT. (Bug#54408)

InnoDB Storage Engine: For an InnoDB table created with ROW_FORMAT=COMPRESSED or ROW_FORMAT=DYNAMIC, a query using the READ UNCOMMITTED isolation level could cause the server to stop with an assertion error, if BLOB or other large columns that use off-page storage were being inserted at the same time. (Bug#54358)

Partitioning: UPDATE and INSERT statements affecting partitioned tables performed poorly when using row-based replication. (Bug#52517)

Partitioning: INSERT ON DUPLICATE KEY UPDATE statements performed poorly on tables having many partitions. This was because the handler function for reading a row from a specific index was not optimized in the partitioning handler. (Bug#52455)

GROUP BY operations used max_sort_length inconsistently. (Bug#55188)

Building MySQL on Solaris 8 x86 failed when using Sun Studio due to gcc inline assembly code. (Bug#55061)

In debug builds, an assertion could be raised when the server tried to send an OK packet to the client after having failed to detect errors during processing of the WHERE condition of an UPDATE statement. (Bug#54734)

A client could supply data in chunks to a prepared statement parameter other than of type TEXT or BLOB using the mysql_stmt_send_long_data() C API function (or COM_STMT_SEND_LONG_DATA command). This led to a crash because other data types are not valid for long data. (Bug#54041)

mysql_secure_installation did not properly identify local accounts and could incorrectly remove nonlocal root accounts. (Bug#54004)

Portability problems in SHOW STATUS could lead to incorrect results on some platforms. (Bug#53493)

Builds of MySQL generated a large number of warnings. (Bug#53445)

With lower_case_table_names set to a nonzero value, searches for table or database names in INFORMATION_SCHEMA tables could produce incorrect results. (Bug#53095)

The ABI check for MySQL failed to compile with gcc 4.5. (Bug#52514)

mysql_secure_installation sometimes failed to locate the mysql client. (Bug#52274)

Reading a ucs2 data file with LOAD DATA INFILE was subject to three problems. 1) Incorrect parsing of the file as ucs2 data, resulting in incorrect length of the parsed string. This is fixed by truncating the invalid trailing bytes (incomplete multibyte characters) when reading from the file. 2) Reads from a proper ucs2 file did not recognize newline characters. This is fixed by first checking whether a byte is a newline (or any other special character) before reading it as a part of a multibyte character. 3) When using user variables to hold column data, the character set of the user variable was set incorrectly to the database charset. This is fixed by setting it to the character set specified in the LOAD DATA INFILE statement, if any. (Bug#51876)

Searches in INFORMATION_SCHEMA tables for rows matching a nonexistent database produced an error instead of an empty query result. (Bug#49542)

On FreeBSD, memory mapping for MERGE tables could fail if underlying tables were empty. (Bug#47139)

The my_like_range_xxx() functions returned badly formed maximum strings for Asian character sets, which caused problems for storage engines. (Bug#45012)

A debugging assertion could be raised after a write failure to a closed socket. (Bug#42496)

An assertion failure occurred within yaSSL for very long keys. (Bug#29784)

See also Bug#53463.

Building MySQL on Solaris 8 x86 failed when using Sun Studio due to gcc inline assembly code. (Bug#55061)

A client could supply data in chunks to a prepared statement parameter other than of type TEXT or BLOB using the mysql_stmt_send_long_data() C API function (or COM_STMT_SEND_LONG_DATA command). This led to a crash because other data types are not valid for long data. (Bug#54041)

InnoDB Plugin has been upgraded to version 1.0.10. This version is considered of General Availability (GA) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), generic Linux RPM packages, and any builds produced with the icc compiler. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

InnoDB Storage Engine: Security Fix: After changing the values of the innodb_file_format or innodb_file_per_table configuration parameters, DDL statements could cause a server crash. (Bug#55039, CVE-2010-3676)

Security Fix: Joins involving a table with a unique SET column could cause a server crash. (Bug#54575, CVE-2010-3677)

Security Fix: Incorrect handling of NULL arguments could lead to a crash for IN() or CASE operations when NULL arguments were either passed explicitly as arguments (for IN()) or implicitly generated by the WITH ROLLUP modifier (for IN() and CASE). (Bug#54477, CVE-2010-3678)

Security Fix: A malformed argument to the BINLOG statement could result in Valgrind warnings or a server crash. (Bug#54393, CVE-2010-3679)

Security Fix: Use of TEMPORARY InnoDB tables with nullable columns could cause a server crash. (Bug#54044, CVE-2010-3680)

Security Fix: The server could crash if there were alternate reads from two indexes on a table using the HANDLER interface. (Bug#54007, CVE-2010-3681)

Security Fix: Using EXPLAIN with queries of the form SELECT ... UNION ... ORDER BY (SELECT ... WHERE ...) could cause a server crash. (Bug#52711, CVE-2010-3682)

Security Fix: LOAD DATA INFILE did not check for SQL errors and sent an OK packet even when errors were already reported. Also, an assert related to client/server protocol checking in debug servers sometimes was raised when it should not have been. (Bug#52512, CVE-2010-3683)

InnoDB Storage Engine: An ALTER TABLE statement could convert an InnoDB compressed table (with row_format=compressed) back to an uncompressed table (with row_format=compact). (Bug#54679)

InnoDB Storage Engine: InnoDB could issue an incorrect message on startup, if tables were created under the setting innodb_file_per_table=ON. The message was of the form InnoDB: Warning: allocated tablespace n, old maximum was 0 and is no longer displayed during restarts after you have upgraded the MySQL server and created at least one InnoDB table with innodb_file_per_table=ON. If you continue to encounter this message, you might have corruption in your shared tablespace; if so, back up and reload your data. (Bug#54658)

InnoDB Storage Engine: Fast index creation in the InnoDB Plugin could fail, leaving the new secondary index corrupted. (Bug#54330)

InnoDB Storage Engine: Some combinations of SELECT and SELECT FOR UPDATE statements could fail with errors about locks, or incorrectly release a row lock during a semi-consistent read operation. (Bug#53674)

InnoDB Storage Engine: Performing large numbers of RENAME TABLE statements caused excessive memory use. (Bug#47991)

InnoDB Storage Engine: The mechanism that checks if there is enough space for redo logs was improved, reducing the chance of encountering this message: ERROR: the age of the last checkpoint is x, which exceeds the log group capacity y. (Bug#39168)

Replication: When using unique keys on NULL columns in row-based replication, the slave sometimes chose the wrong row when performing an update. This happened because a table having a unique key on such a column could have multiple rows containing NULL for the column used by the unique key, and the slave merely picked the first row containing NULL in that column. (Bug#53893)

Replication: FLUSH LOGS could in some circumstances crash the server. This occurred because the I/O thread could concurrently access the relay log I/O cache while another thread was performing the FLUSH LOGS, which closes and reopens the relay log and, while doing so, initializes (or re-initializes) its I/O cache. This could cause problems if some other thread (in this case, the I/O thread) is accessing it at the same time.

Now the thread performing the FLUSH LOGS takes a lock on the relay log before actually flushing it. (Bug#53657)

See also Bug#50364.

Replication: Two related issues involving temporary tables and transactions were introduced by a fix made in MySQL 5.1.37:

The current fix restores the correct behavior in both of these cases. (Bug#53560)

This regression was introduced by Bug#43929.

Replication: When CURRENT_USER() or CURRENT_USER was used to supply the name and host of the affected user or of the definer in any of the statements DROP USER, RENAME USER, GRANT, REVOKE, and ALTER EVENT, the reference to CURRENT_USER() or CURRENT_USER was not expanded when written to the binary log. This resulted in CURRENT_USER() or CURRENT_USER being expanded to the user and host of the slave SQL thread on the slave, thus breaking replication. Now CURRENT_USER() and CURRENT_USER are expanded prior to being written to the binary log in such cases, so that the correct user and host are referenced on both the master and the slave. (Bug#48321)

A signal-handler redefinition for SIGUSR1 was removed. The redefinition could cause the server to encounter a kernel deadlock on Solaris when there are many active threads. Other POSIX platforms might also be affected. (Bug#54667)

The make_binary_distribution target to make could fail on some platforms because the lines generated were too long for the shell. (Bug#54590)

The server failed to disregard sort order for some zero-length tuples, leading to an assertion failure. (Bug#54459)

The default value of myisam_max_extra_sort_file_size could be higher than the maximum accepted value, leading to warnings upon the server start. (Bug#54457)

Inconsistent checking of the relationship between SHOW statements and INFORMATION_SCHEMA queries caused such queries to fail sometimes. (Bug#54422)

If a session tried to drop a database containing a table opened with HANDLER in another session, any DATABASE statement (CREATE, DROP, ALTER) executed by that session produced a deadlock. (Bug#54360)

Builds of the embedded mysqld would fail due to a missing element of the struct NET. (Bug#53908, Bug#53912)

The definition of the MY_INIT macro in my_sys.h included an extraneous semicolon, which could cause compilation failure. (Bug#53906)

A client with automatic reconnection enabled saw the error message Lost connection to MySQL server during query if the connection was lost between the mysql_stmt_prepare() and mysql_stmt_execute() C API functions. However, mysql_stmt_errno() returned 0, not the corresponding error number 2013. (Bug#53899)

Queries that used MIN() or MAX() on indexed columns could be optimized incorrectly. (Bug#53859)

The Lock_time value in the slow query log was negative for stored routines. (Bug#53191)

The results of some ORDER BY ... DESC queries were sorted incorrectly. (Bug#51431)

Index Merge between three indexes could return incorrect results. (Bug#50389)

The server could crash with an out of memory error when trying to parse a query that was too long to fit in memory. Now the parser rejects such queries with an ER_OUT_OF_RESOURCES error. (Bug#42064)

Sort-index_merge for join tables other than the first table used excessive memory. (Bug#41660)

Valgrind warnings in the InnoDB compare_record() function were corrected. (Bug#38999)

mysqld could fail during execution when using SSL. (Bug#34236)

The behavior of the RPM upgrade installation has changed. During an upgrade installation using the RPM packages, if the MySQL server is running when the upgrade occurs, the server is stopped, the upgrade occurs, and server is restarted. If the server is not already running when the RPM upgrade occurs, the server is not started at the end of the upgrade. The boot scripts for MySQL are installed in the appropriate directories in /etc, so the MySQL server will be restarted automatically at the next machine reboot. (Bug#27072)

InnoDB Plugin has been upgraded to version 1.0.9. This version is considered of General Availability (GA) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), generic Linux RPM packages, and any builds produced with the icc compiler. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

The Rows_examined value in slow query log rows now is nonzero for UPDATE and DELETE statements that modify rows. (Bug#49756)

Important Change: Replication: MyISAM transactions replicated to a transactional slave left the slave in an unstable condition. This was due to the fact that, when replicating from a nontransactional storage engine to a transactional engine with autocommit turned off, no BEGIN and COMMIT statements were written to the binary log; thus, on the slave, a never-ending transaction was started.

The fix for this issue includes enforcing autocommit mode on the slave by replicating all autocommit=1 statements from the master. (Bug#29288)

InnoDB Storage Engine: Replication: Reading from a table that used a self-logging storage engine and updating a table that used a transactional engine (such as InnoDB) generated changes that were written to the binary log using statement format which could make slaves diverge. However, when using mixed logging format, such changes should be written to the binary log using row format. (This issue did not occur when reading from tables using a self-logging engine and updating MyISAM tables, as this was already handled by checking for combinations of non-transactional and transactional engines.) Now such statements are classified as unsafe, and in mixed mode, cause a switch to row-based logging. (Bug#49019)

InnoDB Storage Engine: The server could crash with a message InnoDB: Assertion failure in thread nnnn, typically during shutdown on a Windows system. (Bug#53947)

InnoDB Storage Engine: Adding a unique key on multiple columns, where one of the columns is null, could mistakenly report duplicate key errors. (Bug#53290)

InnoDB Storage Engine: Fixed a checksum error reported for compressed tables when the --innodb_checksums option is enabled. Although the message stated that the table was corrupted, the table is actually fine after the fix. (Bug#53248)

InnoDB Storage Engine: Corrected the handling of the setting innodb_change_buffering=default. (The appropriate default value is different between MySQL 5.1 and 5.5.) (Bug#53165)

InnoDB Storage Engine: Multi-statement execution could fail with an error about foreign key constraints. This problem could affect calls to mysql_query() and mysql_real_query(), and CALL statements that invoke stored procedures. (Bug#48024)

InnoDB Storage Engine: If a crash occurs while creating an index using the InnoDB “Fast Index Creation” mechanism, the partially created index is dropped during the crash recovery processing when the database is restarted.

Partitioning: ALTER TABLE statements that cause table partitions to be renamed or dropped (such as ALTER TABLE ... ADD PARTITION, ALTER TABLE ... DROP PARTITION, and ALTER TABLE ... REORGANIZE PARTITION) — when run concurrently with queries against the INFORMATION_SCHEMA.PARTITIONS table — could fail, cause the affected partitioned tables to become unusable, or both. This was due to the fact that the INFORMATION_SCHEMA database ignored the name lock imposed by the ALTER TABLE statement on the partitions affected. In particular, this led to problems with InnoDB tables, because InnoDB would accept the rename operation, but put it in a background queue, so that subsequent rename operations failed when InnoDB was unable to find the correct partition. Now, INFORMATION_SCHEMA honors name locks imposed by ongoing ALTER TABLE statements that cause partitions to be renamed or dropped. (Bug#50561)

See also Bug#47343, Bug#45808.

Partitioning: It was possible to execute a CREATE TEMPORARY TABLE tmp LIKE pt statement, where pt is a partitioned table, even though partitioned temporary tables are not permitted, which caused the server to crash. Now a check is performed to prevent such statements from being executed. (Bug#49477)

Partitioning: When attempting to perform DDL on a partitioned table and the table's .par file could not be found, the server returned the inaccurate error message Out of memory; restart server and try again (needed 2 bytes). Now in such cases, the server returns the error Failed to initialize partitions from .par file. (Bug#49161)

Replication: In some cases, attempting to update a column with a value of an incompatible type resulted in a mismatch between master and slave because the column value was set to its implicit default value on the master (as expected), but the same column on the slave was set to NULL. (Bug#52868)

Replication: When using a non-transactional table on the master with autocommit disabled, no COMMIT was recorded in the binary log following a statement affecting this table. If the slave's copy of the table used a transactional storage engine, the result on the slave was as though a transaction had been started, but never completed. (Bug#49522)

See also Bug#29288.

Valgrind warnings resulting from passing incomplete DATETIME values to the TIMESTAMP() function were corrected. (Bug#53942)

UPDATE on an InnoDB table modifying the same index that was used to satisfy the WHERE condition could trigger a debug assertion under some circumstances. (Bug#53830)

MySQL incorrectly processed ALTER DATABASE `#mysql50#<special>` UPGRADE DATA DIRECTORY NAME where <special> was ., .., or a sequence starting with ./ or ../. It used the server data directory (that contains other regular databases) as the database directory. (Bug#53804, CVE-2010-2008)

InnoDB crashed when replacing duplicates in a table after a fast ALTER TABLE added a unique index. (Bug#53592)

For InnoDB tables, the error handler for a fast CREATE INDEX did not reset the error state of the transaction before attempting to undo a failed operation, resulting in a crash. (Bug#53591)

For single-table DELETE statements that used quick select and index scan simultaneously caused a server crash or assertion failure. (Bug#53450)

Incorrect results could be returned for LEFT JOIN of InnoDB tables with an impossible WHERE condition. (Bug#53334)

Setting the innodb_change_buffering system variable to DEFAULT produced an incorrect result. (Bug#53165)

mysqldump and SELECT ... INTO OUTFILE truncated long BLOB and TEXT values to 766 bytes. (Bug#53088)

In the debug version of the server, the FreeState() function could in some circumstances be called twice, leading to an assertion failure. (Bug#52884)

Aggregate functions could incorrectly return NULL in outer join queries. (Bug#52051)

For outer joins, the optimizer could fail to properly calculate table dependencies. (Bug#52005)

The Loose Index Scan optimization method assumed that it could depend on the partitioning engine to maintain interval endpoint information, as if it were a storage engine. (Bug#50939)

Calculation of intervals for Event Scheduler events was not portable. (Bug#50087)

Selecting from INFORMATION_SCHEMA.ROUTINES or INFORMATION_SCHEMA.PARAMETERS resulted in a memory leak. (Bug#48729)

On Intel x86 machines, the optimizer could choose different execution plans for a query depending on the compiler version and optimization flags used to build the server binary. (Bug#48537)

When the transaction isolation level was REPEATABLE READ and binary logging used statement or mixed format, SELECT statements with subqueries referencing InnoDB tables unnecessarily acquired shared locks on rows in these tables. (Bug#46947)

Using an initial command with mysql_options(..., MYSQL_INIT_COMMAND, ...) that generated multiple result sets (such as a stored procedure or a multi-statement command) left the connection unusable. (Bug#42373)

InnoDB Plugin has been upgraded to version 1.0.8. This version is considered of General Availability (GA) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

InnoDB Storage Engine: InnoDB stores redo log records in a hash table during recovery. On 64-bit systems, this hash table was 1/8 of the buffer pool size. To reduce memory usage, the dimension of the hash table was reduced to 1/64 of the buffer pool size (or 1/128 on 32-bit systems). (Bug#53122)

Performance: InnoDB Storage Engine: Deadlock detection could be a bottleneck in InnoDB processing, if many transactions attempted to update the same row simultaneously. The algorithm has been improved to enhance performance and scalability, in the InnoDB Plugin for MySQL 5.1, and in InnoDB 1.1 for MySQL 5.5. (Bug#49047)

Security Fix: The server failed to check the table name argument of a COM_FIELD_LIST command packet for validity and compliance to acceptable table name standards. This could be exploited to bypass almost all forms of checks for privileges and table-level grants by providing a specially crafted table name argument to COM_FIELD_LIST.

In MySQL 5.0 and above, this permitted an authenticated user with SELECT privileges on one table to obtain the field definitions of any table in all other databases and potentially of other MySQL instances accessible from the server's file system.

Additionally, for MySQL version 5.1 and above, an authenticated user with DELETE or SELECT privileges on one table could delete or read content from any other table in all databases on this server, and potentially of other MySQL instances accessible from the server's file system. (Bug#53371, CVE-2010-1848)

Security Fix: The server was susceptible to a buffer-overflow attack due to a failure to perform bounds checking on the table name argument of a COM_FIELD_LIST command packet. By sending long data for the table name, a buffer is overflown, which could be exploited by an authenticated user to inject malicious code. (Bug#53237, CVE-2010-1850)

Security Fix: The server could be tricked into reading packets indefinitely if it received a packet larger than the maximum size of one packet. (Bug#50974, CVE-2010-1849)

Important Change: Replication: When invoked, CHANGE MASTER TO and SET GLOBAL sql_slave_skip_counter now cause information to be written to the error log about the slave's state prior to execution of the statement. For CHANGE MASTER TO, this information includes the previous values for MASTER_HOST, MASTER_PORT, MASTER_LOG_FILE, and MASTER_LOG_POS. For SET GLOBAL sql_slave_skip_counter, this information includes the previous values of sql_slave_skip_counter, the group relay log name, and the group relay log position. (Bug#43406, Bug#43407)

InnoDB Storage Engine: When reporting a foreign key constraint violation during INSERT, InnoDB could display uninitialized data for the DB_TRX_ID and DB_ROLL_PTR system columns. (Bug#53202)

InnoDB Storage Engine: The values of innodb_buffer_pool_pages_total and innodb_buffer_pool_pages_misc in the information_schema.global_status table could be computed incorrectly. (Bug#52983)

InnoDB Storage Engine: InnoDB page splitting could enter an infinite loop for compressed tables. (Bug#52964)

InnoDB Storage Engine: An overly strict assertion could fail during the purge of delete-marked records in DYNAMIC or COMPRESSED InnoDB tables that contain column prefix indexes. (Bug#52746)

InnoDB Storage Engine: InnoDB attempted to choose off-page storage without ensuring that there was an “off-page storage” flag in the record header. To correct this, in DYNAMIC and COMPRESSED formats, InnoDB stores locally any non-BLOB columns having a maximum length not exceeding 256 bytes. This is because there is no room for the “external storage” flag when the maximum length is 255 bytes or less. This restriction trivially holds in REDUNDANT and COMPACT formats, because there InnoDB always stores locally columns having a length up to local_len = 788 bytes. (Bug#52745)

InnoDB Storage Engine: Connections waiting for an InnoDB row lock ignored KILL until the row lock wait ended. Now, KILL during lock wait results in “query interrupted” instead of “lock wait timeout exceeded”. The corresponding transaction is rolled back. (Bug#51920)

InnoDB Storage Engine: InnoDB Plugin checks to see whether a row could possibly exceed the maximum size if all columns are fully used. This produced Row size too large errors for some tables that could be created with the built-in InnoDB. Now the check is only done when innodb_strict_mode is enabled or if the table is dynamic or compressed. (Bug#50495)

InnoDB Storage Engine: A mismatch between index information maintained within the .frm files and the corresponding information in the InnoDB system tablespace could produce this error: [ERROR] Index index of table has n columns unique inside InnoDB, but MySQL is asking statistics for m columns. Have you mixed up .frm files from different installations? (Bug#44571)

Replication: The failure of a REVOKE statement was logged with the wrong error code, causing replication slaves to stop even when the failure was expected on the master. (Bug#51987)

Certain path names passed to LOAD_FILE() could cause a server crash. (Bug#53417)

Semi-consistent read was implemented for InnoDB to address Bug#3300. Semi-consistent reads do not block when a nonmatching record is already locked by some other transaction. If the record is not locked, a lock is acquired, but is released if the record does not match the WHERE condition. However, semi-consistent read was attempted even for UPDATE statements having a WHERE condition of the form pk_col1=constant1, ..., pk_colN=constantN. Some code that was designed with the assumption that semi-consistent read would be only attempted on table scans, failed. (Bug#52663)

Setting @@GLOBAL.debug to an empty string failed to clear the current debug settings. (Bug#52629)

A memory leak occurred due to missing deallocation of the comparators array (a member of the Arg_comparator class). (Bug#52124)

For debug builds, creating a view containing a subquery that might require collation adjustment caused an assertion to be raised. For example, this could occur if some items had different collations but the result collation could be adjusted to the one of them. (Bug#52120)

Locking involving the LOCK_plugin, LOCK_global_system_variables, and LOCK_status mutexes could deadlock. (Bug#51591)

InnoDB fast index creation could incorrectly use a table copy in some cases. (Bug#50946)

A syntactically invalid trigger could cause the server to crash when trying to list triggers. (Bug#50755)

Setting --secure-file-priv to the empty string left the value unaffected. (Bug#50373)

In MySQL 5.1, READ COMMITTED was changed to use less locking due to the availability of row based binary logging (see the Note under READ COMMITTED at Section 12.3.6, “SET TRANSACTION Syntax”). However, READ UNCOMMITTED did not have the same change, so it was using more locks than the higher isolation level, which is unexpected. This was changed so that READ UNCOMMITTED now also uses the lesser amount of locking and has the same restrictions for binary logging. (Bug#48607)

EXPLAIN could cause a server crash for some queries with subqueries. (Bug#48419)

On Windows, the server failed to find a description for Event ID 100. (Bug#48042)

For updates to InnoDB tables, TIMESTAMP columns could be updated even when no values actually changed. (Bug#47453)

mysqld_safe did not always pass --open-files-limit through to mysqld. mysqld_safe did not treat dashes and underscores as equivalent in option names. (Bug#47095)

If the server is started with --skip-grant-tables, plugin loading and unloading should be prohibited, but the server failed to reject INSTALL PLUGIN and UNINSTALL PLUGIN statements. (Bug#46261)

InnoDB could fail to create a unique index on NULL columns. (Bug#41904)

Storage engine plugins on Windows could've been built with a definition of time_t which was different from the server expectations. The difference could cause affected plugins to crash. In addition, the use of the time_t type in the storage engine API layer has been enforced. (Bug#39802, Bug#40092)

When using UNINSTALL PLUGIN to remove a loaded plugin, open tables and connections caused mysqld to hang until the open connections had been closed. (Bug#39053)

1) In rare cases, if a thread was interrupted during a FLUSH PRIVILEGES operation, a debug assertion occurred later due to improper diagnostics area setup. 2) A KILL operation could cause a console error message referring to a diagnostic area state without first ensuring that the state existed. (Bug#33982)

Security Fix: The server failed to check the table name argument of a COM_FIELD_LIST command packet for validity and compliance to acceptable table name standards. This could be exploited to bypass almost all forms of checks for privileges and table-level grants by providing a specially crafted table name argument to COM_FIELD_LIST.

In MySQL 5.0 and above, this permitted an authenticated user with SELECT privileges on one table to obtain the field definitions of any table in all other databases and potentially of other MySQL instances accessible from the server's file system.

Additionally, for MySQL version 5.1 and above, an authenticated user with DELETE or SELECT privileges on one table could delete or read content from any other table in all databases on this server, and potentially of other MySQL instances accessible from the server's file system. (Bug#53371, CVE-2010-1848)

Security Fix: The server was susceptible to a buffer-overflow attack due to a failure to perform bounds checking on the table name argument of a COM_FIELD_LIST command packet. By sending long data for the table name, a buffer is overflown, which could be exploited by an authenticated user to inject malicious code. (Bug#53237, CVE-2010-1850)

Security Fix: The server could be tricked into reading packets indefinitely if it received a packet larger than the maximum size of one packet. (Bug#50974, CVE-2010-1849)

InnoDB Storage Engine: InnoDB page splitting could enter an infinite loop for compressed tables. (Bug#52964)

InnoDB Storage Engine: InnoDB attempted to choose off-page storage without ensuring that there was an “off-page storage” flag in the record header. To correct this, in DYNAMIC and COMPRESSED formats, InnoDB stores locally any non-BLOB columns having a maximum length not exceeding 256 bytes. This is because there is no room for the “external storage” flag when the maximum length is 255 bytes or less. This restriction trivially holds in REDUNDANT and COMPACT formats, because there InnoDB always stores locally columns having a length up to local_len = 788 bytes. (Bug#52745)

MySQL incorrectly processed ALTER DATABASE `#mysql50#<special>` UPGRADE DATA DIRECTORY NAME where <special> was ., .., or a sequence starting with ./ or ../. It used the server data directory (that contains other regular databases) as the database directory. (Bug#53804, CVE-2010-2008)

A syntactically invalid trigger could cause the server to crash when trying to list triggers. (Bug#50755)

Selecting from INFORMATION_SCHEMA.ROUTINES or INFORMATION_SCHEMA.PARAMETERS resulted in a memory leak. (Bug#48729)

EXPLAIN could cause a server crash for some queries with subqueries. (Bug#48419)

InnoDB Plugin has been upgraded to version 1.0.7. This version is considered of General Availability (GA) quality. InnoDB Plugin Change History, may contain information in addition to those changes reported here.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

There is a new system variable, skip_name_resolve, that is set from the value of the --skip-name-resolve server option. This provides a way to determine at runtime whether the server uses name resolution for client connections. (Bug#37168)

Performance: InnoDB Storage Engine: The redo scan during InnoDB recovery used excessive CPU. The efficiency of this scan was improved for InnoDB Plugin, significantly speeding up crash recovery. (Bug#49535, Bug#29847)

Performance: InnoDB Storage Engine: InnoDB Plugin page-freeing operations were made faster for compressed blocks, speeding up ALTER TABLE, DROP TABLE, and other operations on compressed tables that free compressed blocks. One symptom of the older behavior could be 100% CPU use during these operations. (Bug#35077)

Performance: While looking for the shortest index for a covering index scan, the optimizer did not consider the full row length for a clustered primary key, as in InnoDB. Secondary covering indexes will now be preferred, making full table scans less likely. (Bug#39653)

See also Bug#55656.

Security Fix: Privilege checking for UNINSTALL PLUGIN was incorrect. (Bug#51770, CVE-2010-1621)

Important Change: When using fast ALTER TABLE, different internal ordering of indexes in the MySQL optimizer and the InnoDB storage engine could cause error messages about possibly mixed up .frm files and incorrect index use. (Bug#47622)

InnoDB Storage Engine: Replication: TRUNCATE TABLE performed on a temporary table using the InnoDB storage engine was logged even when using row-based mode. (Bug#51251)

InnoDB Storage Engine: Replication: Column length information generated by InnoDB did not match that generated by MyISAM, which caused invalid metadata to be written to the binary log when trying to replicate BIT columns. (Bug#49618)

InnoDB Storage Engine: For InnoDB Plugin, bit fields were causing problems with concurrency on SMP systems because of word-packing issues. (Bug#52360)

InnoDB Storage Engine: Fixed a performance issue on Windows systems that affected the InnoDB Plugin, by turning off atomic instructions. (Bug#52102)

InnoDB Storage Engine: The AIX implementation of readdir_r() caused InnoDB errors. (Bug#50691)

Partitioning: Partition pruning on RANGE partitioned tables did not always work correctly; the last partition was not excluded if the range was beyond it (when not using MAXVALUE). Now the last partition is not included if the partitioning function value is not within the range. (Bug#51830)

Partitioning: The insert_id server system variable was not reset following an insert that failed on a partitioned MyISAM table having an AUTO_INCREMENT column. (Bug#50392)

Partitioning: Foreign keys are not supported on partitioned tables. However, it was possible using an ALTER TABLE statement to set a foreign key on a partitioned table; it was also possible to partition a table with a single foreign key. (Bug#50104)

Partitioning: GROUP BY queries performed poorly for some partitioned tables. This was due to the block size not being set for partitioned tables, thus the keys per block was not correct, which could cause such queries to be optimized incorrectly. (Bug#48229)

See also Bug#37252.

Partitioning: REPAIR TABLE failed for partitioned ARCHIVE tables. (Bug#46565)

Replication: When using temporary tables the binary log needs to insert a pseudo-thread ID for threads that are using temporary tables, each time a switch happens between two threads, both of which are using temporary tables. However, if a thread issued a failing statement before exit, its ID was not recorded in the binary log, and this in turn caused the ID for the next thread that tried to do something with a temporary table not to be logged as well. Subsequent replays of the binary log failed with the error Table ... doesn't exist. (Bug#51226)

Replication: If the master was using sql_mode='TRADITIONAL', duplicate key errors were not sent to the slave, which received 0 rather than the expected error code. This caused replication to fail even when such an error was expected. (Bug#51055)

Replication: When run with the --database option, mysqlbinlog printed ROLLBACK statements but did not print any corresponding SAVEPOINT statements. (Bug#50407)

Replication: When a CREATE EVENT statement was followed by an additional statement and the statements were executed together as a single statement, the CREATE EVENT statement was padded with “garbage” characters when written to the binary log, which led to a syntax error when trying to read back from the log. (Bug#50095)

Replication: The value of Slave_IO_running in the output of SHOW SLAVE STATUS did not distinguish between all 3 possible states of the slave I/O thread (not running; running but not connected; connected). Now the value Connecting (rather than No) is shown when the slave I/O thread is running but the slave is not connected to a replication master.

The server system variable Slave_running also reflects this change, and is now consistent with what is shown for Slave_IO_running. (Bug#30703, Bug#41613, Bug#51089)

EXPLAIN EXTENDED crashed trying to resolve references to freed temporary table columns for GROUP_CONCAT() ORDER BY arguments. (Bug#52397)

The optimizer could attempt to evaluate the WHERE clause before any rows had been read, resulting in a server crash. (Bug#52177)

For LDML-defined collations, some data structures were not initialized properly to enable UPPER() and LOWER() to work correctly. (Bug#51976)

On Windows, LOAD_FILE() could cause a crash for some pathnames. (Bug#51893)

Invalid memory reads occurred for HANDLER ... READ NEXT after a failed HANDLER ... READ FIRST. (Bug#51877)

After TRUNCATE TABLE of a MyISAM table, subsequent queries could crash the server if myisam_use_mmap was enabled. (Bug#51868)

If myisam_sort_buffer_size was set to a small value, table repair for MyISAM tables with FULLTEXT indexes could crash the server. (Bug#51866)

In LOAD DATA INFILE, using a SET clause to set a column equal to itself caused a server crash. (Bug#51850)

A problem with equality propagation optimization for prepared statements and stored procedures caused a server crash upon re-execution of the prepared statement or stored procedure. (Bug#51650)

See also Bug#8115, Bug#8849.

The optimizer performed an incorrect join type when COALESCE() appeared within an IN() operation. (Bug#51598)

The server crashed when the optimizer attempted to determine constant tables but a table storage engine did not support exact record count. (Bug#51494)

A unique index on a column prefix could not be upgraded to a primary index even if there was no primary index already defined. (Bug#51378)

The server could crash populating the INFORMATION_SCHEMA.PROCESSLIST table due to lack of mutex protection. (Bug#51377)

Use of HANDLER statements with tables that had spatial indexes caused a server crash. (Bug#51357)

With an XA transaction active, SET autocommit = 1 could cause side effects such as memory corruption or a server crash. (Bug#51342)

Following a bulk insert into a MyISAM table, if MyISAM failed to build indexes using repair by sort, data file corruption could occur. (Bug#51307)

CHECKSUM TABLE could compute the checksum for BIT columns incorrectly. (Bug#51304)

A HAVING clause on a joined table in some cases failed to eliminate rows which should have been excluded from the result set. (Bug#51242)

The type inference used for view columns caused some columns in views to be handled as the wrong type, as compared to the same columns in base tables. DATE columns in base tables were treated as TIME columns in views, and base table TIME columns as view DATETIME columns. (Bug#50918)

The YEAR values 2000 and 0000 could be treated as equal. (Bug#49910)

Performing a single in-place ALTER TABLE containing ADD INDEX and DROP INDEX options that used the same index name could result in a corrupt table definition file. Now such ALTER TABLE statements are no longer performed in place. (Bug#49838)

mysql_upgrade did not detect when CSV log tables incorrectly contained columns that could be NULL. Now these columns are altered to be NOT NULL. (Bug#49823)

InnoDB would return an error when inserting a negative value into an auto-increment column. (Bug#49497)

InnoDB did not reset table AUTO_INCREMENT values to the last used values after a server restart. (Bug#49032)

If a stored function contained a RETURN statement with an ENUM value in the ucs2 character set, SHOW CREATE FUNCTION and SELECT DTD_IDENTIFIER FROM INFORMATION_SCHEMA.ROUTINES returned incorrect values. (Bug#48766)

A trigger could change the behavior of assigning NULL to a NOT NULL column. (Bug#48525)

The server crashed when it could not determine the best execution plan for queries involving outer joins with nondeterministic ON clauses such as the ones containing the RAND() function, a user-defined function, or a NOT DETERMINISTIC stored function. (Bug#48483)

The MERGE engine failed to open a child table from a different database if the child table or database name contained characters that were the subject of table name to filename encoding.

Further, the MERGE engine did not properly open a child table from the same database if the child table name contained characters such as '/', '#'. (Bug#48265)

A query that read from a derived table (of the form SELECT ... FROM (SELECT ...)) produced incorrect results when the following conditions were present:

(Bug#47904)

The optimization to read MIN() or MAX() values from an index did not properly handle comparisons with NULL values. This could produce incorrect results for MIN() or MAX()when the WHERE clause tested a NOT NULL column for NULL. (Bug#47762)

Killing a query during the optimization phase of a subquery could cause a server crash. (Bug#47761)

The query shown by EXPLAIN EXTENDED plus SHOW WARNINGS could produce results different from the original query. (Bug#47669)

Renaming a column of an InnoDB table caused the server to go out of sync with the InnoDB data dictionary. (Bug#47621)

MyISAM could write uninitialized data to new index pages. Now zeros are written to unused bytes in the pages. (Bug#47598)

Setting myisam_repair_threads larger than 1 could result in the cardinality for all indexes of a MyISAM table being set to 1 after parallel index repair. (Bug#47444)

In debug builds, if the listed columns in the view definition of the table used in an INSERT ... SELECT statement mismatched, an assertion was raised in the query cache invalidation code following the failing statement. (Bug#46615)

For a query that selected from a view and used an alias for the view, the metadata used the alias name rather than the view name in the MYSQL_FIELD.table member. (Bug#41788)

mysql_upgrade did not create temporary files properly. (Bug#41057)

It was possible for DROP TABLE of one MyISAM table to remove the data and index files of a different MyISAM table. (Bug#40980)

If the arguments to a CONCAT() call included a local routine variable, selecting the return value into a user variable could produce an incorrect result. (Bug#40625)

SHOW CREATE VIEW returned invalid SQL if the definition contained a SELECT 'string' statement where the string was longer than the maximum length of a column name, due to the fact that this text was also used as an alias (in the AS clause).

Because not all names retrieved from arbitrary SELECT statements can be used as view column names due to length and format restrictions, the server now checks the conformity of automatically generated column names and rewrites according to a predefined format any names that are not acceptable as view column names before storing the final view definition on disk.

In such cases, the name is now rewritten as Name_exp_pos, where pos is the position of the column. To avoid this conversion scheme, define explicit, valid names for view columns using the column_list clause of the CREATE VIEW statement.

As part of this fix, aliases are now generated only for top-level statements. (Bug#40277)

mysqlbinlog had a memory leak in its option-processing code. (Bug#38468)

The test for readline during configuration failed when trying to build MySQL in a directory other than the source tree root. (Bug#35250)

A query on a FEDERATED table in which the data was ordered by a TEXT column returned incorrect results. For example, a query such as the following would result in incorrect results if column column1 was a TEXT column:

SELECT * FROM table1 ORDER BY column1;

(Bug#32426)

This release includes InnoDB Plugin 1.0.6. This version is considered of Release Candidate (RC) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

mysqltest has a new --max-connections option to set a higher number of maximum permitted server connections than the default 128. This option can also be passed using mysql-test-run.pl. (Bug#51135)

mysql-test-run.pl has a new --portbase option and a corresponding MTR_PORT_BASE environment variable for setting the port range, as an alternative to the existing --build-thread option. (Bug#50182)

mysql-test-run.pl has a new --gprof option that runs the server through the gprof profiler, much the same way the currently supported --gcov option runs it through gcov. (Bug#49345)

mysqltest has a new lowercase_result command that converts the output of the next statement to lowercase. This is useful for test cases where the lettercase may vary between platforms. (Bug#48863)

mysqltest has a new remove_files_wildcard command that removes files matching a pattern from a directory. (Bug#39774)

InnoDB Storage Engine: SHOW INNODB STATUS could display incorrect information about deadlocks, when the deadlock detection routine stops early (to avoid excessive CPU usage). (Bug#49001)

Partitioning: Attempting to drop a partitioned table from one connection while waiting for the completion of an ALTER TABLE that had been issued from a different connection, and that changed the storage engine used by the table, could cause the server to crash. (Bug#42438)

Replication: Adding an index to a table on the master caused the slave to stop logging slow queries to the slow query log. (Bug#50620)

Replication: Queries which were written to the slow query log on the master were not written to the slow query log on the slave. (Bug#23300)

See also Bug#48632.

mysqld_multi failed due to a syntax error in the script. (Bug#51468)

Referring to a subquery result in a HAVING clause could produce incorrect results. (Bug#50995)

Use of filesort plus the join cache normally is preferred to a full index scan. But it was used even if the index is clustered, in which case, the clustered index scan can be faster. (Bug#50843)

For debug builds, SHOW BINARY LOGS caused an assertion to be raised if binary logging was not enabled. (Bug#50780)

The server did not recognize that the stored procedure cache became invalid if a view was created or modified within a procedure, resulting in a crash. (Bug#50624)

Incorrect handling of BIT columns in temporary tables could lead to spurious duplicate-key errors. (Bug#50591)

The second or subsequent invocation of a stored procedure containing DROP TRIGGER could cause a server crash. (Bug#50423)

Full-text queries that used the truncation operator (*) could enter an infinite loop. (Bug#50351)

For debug builds, an assertion was incorrectly raised in the optimizer when matching ORDER BY expressions. (Bug#50335)

Queries optimized with GROUP_MIN_MAX did not clean up KEYREAD optimizations properly, causing subsequent queries to return incomplete rows. (Bug#49902)

For dynamic format MyISAM tables containing LONGTEXT columns, a bulk INSERT ... ON DUPLICATE KEY UPDATE or bulk REPLACE could cause corruption. (Bug#49628)

For debug builds, with sql_safe_updates enabled, a multiple-table UPDATE with the IGNORE modifier could raise an assertion. (Bug#49534)

EXPLAIN EXTENDED crashed trying to print column names for a subquery in the FROM clause when the table had gone out of scope. (Bug#49487)

For InnoDB tables, the test for using an index for ORDER BY sorting did not distinguish between primary keys and secondary indexes and expected primary key values to be concatenated to index values the way they are to secondary key values. (Bug#49324)

mysqltest no longer lets you execute an SQL statement on a connection after doing a send command, unless you do a reap first. This was previously accepted but could produce unpredictable results. (Bug#49269)

For debug builds on Windows, warnings about incorrect use of debugging directives were written to the error log. The directives were rewritten to eliminate these messages. (Bug#49025)

An ARZ file missing from the database directory caused the server to crash. (Bug#48757)

Running SHOW CREATE TABLE on a view v1 that contained a function which accessed another view v2 could trigger a infinite loop if the view (v2) referenced within the function caused a warning to be raised while being opened. (Bug#48449)

Invalid memory reads could occur following a query that referenced a MyISAM tale multiple times with a write lock. (Bug#48438)

For debug builds, creating a view containing a row constructor caused an assertion to be raised. (Bug#48294)

Slow CALL statements were not always logged to the slow query log because execution time for multiple-statement stored procedures was assessed incorrectly. (Bug#47905)

For debug builds, killing a SELECT retrieving from a view that was processing a function caused an assertion to be raised. (Bug#47736)

Failure to open a view with a nonexistent DEFINER was improperly handled and the server would crash later attempting to lock the view. (Bug#47734)

If EXPLAIN encountered an error in the query, a memory leak occurred. (Bug#45989)

Grouping by a subquery in a query with a DISTINCT aggregate function led to incorrect and unordered grouping values. (Bug#45640)

Propagation of a large unsigned numeric constant in WHERE expressions could lead to incorrect results. This also affected EXPLAIN EXTENDED, which printed incorrect numeric constants in such transformed WHERE expressions. (Bug#45360)

Valgrind warnings about uninitialized variables in optimizer code were corrected. (Bug#45195)

flush_cache_records() did not correctly check for errors that should cause statement execution to stop, leading to a server crash. (Bug#39022)

InnoDB logged an error repeatedly trying to load a page into the buffer pool, filling the error log and using excessive disk space. Now the number of attempts is limited to 100, after which the operation aborts with a message. (Bug#38901)

When building MySQL when using a different target directory (for example using the VPATH environment variable), the build of the embedded readline component would fail. (Bug#35250)

INSERT INTO ... VALUES(DEFAULT) failed to insert the correct value for ENUM columns. For MyISAM tables, an empty value was inserted. For CSV tables, the table became corrupt. (Bug#33717)

This release includes InnoDB Plugin 1.0.6. This version is considered of Release Candidate (RC) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

Replication: Introduced the binlog_direct_non_transactional_updates system variable. Enabling this variable causes updates using the statement-based logging format to tables using nontransactional engines to be written directly to the binary log, rather than to the transaction cache.

Before enabling this variable, be certain that you have no dependencies between transactional and nontransactional tables. A statement that both selects from an InnoDB table and inserts into a MyISAM table is an example of such a dependency. For more information, see Section 16.1.3.4, “Binary Log Options and Variables”. (Bug#46364)

See also Bug#28976, Bug#40116.

Performance: The method for comparing INFORMATION_SCHEMA names and database names was nonoptimal and an improvement was made: When the database name length is already known, a length check is made first and content comparison skipped if the lengths are unequal. (Bug#49501)

Performance: The MD5() and SHA1() functions had excessive overhead for short strings. (Bug#49491)

Partitioning: InnoDB Storage Engine: When an ALTER TABLE ... REORGANIZE PARTITION statement on an InnoDB table failed due to innodb_lock_wait_timeout expiring while waiting for a lock, InnoDB did not clean up any temporary files or tables which it had created. Attempting to reissue the ALTER TABLE statement following the timeout could lead to storage engine errors, or possibly a crash of the server. (Bug#47343)

InnoDB Storage Engine: Creating or dropping a table with 1023 transactions active caused an assertion failure. (Bug#49238)

InnoDB Storage Engine: If innodb_force_recovery was set to 4 or higher, the server could crash when opening an InnoDB table containing an auto-increment column. MySQL versions 5.1.31 and later were affected. (Bug#46193)

Replication: In some cases, inserting into a table with many columns could cause the binary log to become corrupted. (Bug#50018)

See also Bug#42749.

Replication: When using row-based replication, setting a BIT or CHAR column of a MyISAM table to NULL, then trying to delete from the table, caused the slave to fail with the error Can't find record in table. (Bug#49481, Bug#49482)

Replication: When logging in row-based mode, DDL statements are actually logged as statements; however, statements that affected temporary tables and followed DDL statements failed to reset the binary log format to ROW, with the result that these statements were logged using the statement-based format. Now the state of binlog_format is restored after a DDL statement has been written to the binary log. (Bug#49132)

Replication: When using row-based logging, the statement CREATE TABLE t IF NOT EXIST ... SELECT was logged as CREATE TEMPORARY TABLE t IF NOT EXIST ... SELECT when t already existed as a temporary table. This was caused by the fact that the temporary table was opened and the results of the SELECT were inserted into it when a temporary table existed and had the same name.

Now, when this statement is executed, t is created as a base table, the results of the SELECT are inserted into it—even if there already exists a temporary table having the same name—and the statement is logged correctly. (Bug#47418)

See also Bug#47442.

Replication: Due to a change in the size of event representations in the binary log, when replicating from a MySQL 4.1 master to a slave running MySQL 5.0.60 or later, the START SLAVE UNTIL statement did not function correctly, stopping at the wrong position in the log. Now the slave detects that the master is using the older version of the binary log format, and corrects for the difference in event size, so that the slave stops in the correct position. (Bug#47142)

The SSL certificates in the test suite were about to expire. They have been updated with expiration dates in the year 2015. (Bug#50642)

The printstack function does not exist on Solaris 8 or earlier, which would lead to a compilation failure. (Bug#50409)

A user could see tables in INFORMATION_SCHEMA.TABLES without appropriate privileges for them. (Bug#50276)

Debug output for join structures was garbled. (Bug#50271)

The filesort sorting method applied to a CHAR(0) column could lead to a server crash. (Bug#49897)

sql_buffer_result had an effect on non-SELECT statements, contrary to the documentation. (Bug#49552)

In some cases a subquery need not be evaluated because it returns only aggregate values that can be calculated from table metadata. This sometimes was not handled by the enclosing subquery, resulting in a server crash. (Bug#49512)

Mixing full-text searches and row expressions caused a crash. (Bug#49445)

mysql-test-run.pl now recognizes the MTR_TESTCASE_TIMEOUT, MTR_SUITE_TIMEOUT, MTR_SHUTDOWN_TIMEOUT, and MTR_START_TIMEOUT environment variables. If they are set, their values are used to set the --testcase-timeout, --suite-timeout, --shutdown-timeout, and --start-timeout options, respectively. (Bug#49210)

The optimizer could continue to execute a query after a storage engine reported an error, leading to a server crash. (Bug#46175)

Partitioning: InnoDB Storage Engine: When an ALTER TABLE ... REORGANIZE PARTITION statement on an InnoDB table failed due to innodb_lock_wait_timeout expiring while waiting for a lock, InnoDB did not clean up any temporary files or tables which it had created. Attempting to reissue the ALTER TABLE statement following the timeout could lead to storage engine errors, or possibly a crash of the server. (Bug#47343)

InnoDB Storage Engine: If innodb_force_recovery was set to 4 or higher, the server could crash when opening an InnoDB table containing an auto-increment column. MySQL versions 5.1.31 and later were affected. (Bug#46193)

Referring to a subquery result in a HAVING clause could produce incorrect results. (Bug#50995)

The filesort sorting method applied to a CHAR(0) column could lead to a server crash. (Bug#49897)

sql_buffer_result had an effect on non-SELECT statements, contrary to the documentation. (Bug#49552)

In some cases a subquery need not be evaluated because it returns only aggregate values that can be calculated from table metadata. This sometimes was not handled by the enclosing subquery, resulting in a server crash. (Bug#49512)

flush_cache_records() did not correctly check for errors that should cause statement execution to stop, leading to a server crash. (Bug#39022)

This release includes InnoDB Plugin 1.0.6. This version is considered of Release Candidate (RC) quality.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on S/390, PowerPC, and generic ia64.

Partitioning: The UNIX_TIMESTAMP() function is now supported in partitioning expressions using TIMESTAMP columns. For example, it now possible to create a partitioned table such as this one:

CREATE TABLE t (c TIMESTAMP) 
PARTITION BY RANGE ( UNIX_TIMESTAMP(c) ) (
    PARTITION p0 VALUES LESS THAN (631148400),
    PARTITION p1 VALUES LESS THAN (946681200),
    PARTITION p2 VALUES LESS THAN (MAXVALUE)
);

All other expressions involving TIMESTAMP values are now rejected with an error when attempting to create a new partitioned table or to alter an existing partitioned table.

When accessing an existing partitioned table having a timezone-dependent partitioning function (where the table was using a previous version of MySQL), a warning rather than an error is issued. In such cases, you should fix the table. One way of doing this is to alter the table's partitioning expression so that it uses UNIX_TIMESTAMP(). (Bug#42849)

Performance: Partitioning: When used on partitioned tables, the records_in_range handler call checked more partitions than necessary. The fix for this issue reduces the number of unpruned partitions checked for statistics in partition range checking, which has resulted in some partition operations being performed up to 2-10 times faster than before this change was made, when testing with tables having 1024 partitions. (Bug#48846)

See also Bug#37252, Bug#47261.

Security Fix: For servers built with yaSSL, a preauthorization buffer overflow could cause memory corruption or a server crash. We thank Evgeny Legerov from Intevydis for providing us with a proof-of-concept script that permitted us to reproduce this bug. (Bug#50227, CVE-2009-4484)

Important Change: Replication: The RAND() function is now marked as unsafe for statement-based replication. Using this function now generates a warning when binlog_format=STATEMENT and causes the format to switch to row-based logging when binlog_format=MIXED.

This change is being introduced because, when RAND() was logged in statement mode, the seed was also written to the binary log, so the replication slave generated the same sequence of random numbers as was generated on the master. While this could make replication work in some cases, the order of affected rows was still not guaranteed when this function was used in statements that could update multiple rows, such as UPDATE or INSERT ... SELECT; if the master and the slave retrieved rows in different order, they began to diverge. (Bug#49222)

InnoDB Storage Engine: When compiling on Windows, an error in the CMake definitions for InnoDB would cause the engine to be built incorrectly. (Bug#49502)

InnoDB Storage Engine: The InnoDB Monitor could fail to print diagnostic information after a long lock wait. (Bug#47814)

InnoDB Storage Engine: Crash recovery did not work for InnoDB temporary tables. (Bug#41609)

Partitioning: A query that searched on a ucs2 column failed if the table was partitioned. (Bug#48737)

Replication: A LOAD DATA INFILE statement that loaded data into a table having a column name that had to be escaped (such as `key` INT) caused replication to fail when logging in mixed or statement mode. In such cases, the master wrote the LOAD DATA event into the binary log without escaping the column names. (Bug#49479)

See also Bug#47927.

Replication: Spatial data types caused row-based replication to crash. (Bug#48776)

Replication: A flaw in the implementation of the purging of binary logs could result in orphaned files being left behind in the following circumstances:

In addition, if the slave was not connected during the purge operation, it was possible for a log file that was in use to be removed; this could lead data loss and possible inconsistencies between the master and slave. (Bug#45292)

Replication: When using the STATEMENT or MIXED logging format, the statements LOAD DATA CONCURRENT LOCAL INFILE and LOAD DATA CONCURRENT INFILE were logged as LOAD DATA LOCAL INFILE and LOAD DATA LOCAL INFILE, respectively (in other words, the CONCURRENT keyword was omitted). As a result, when using replication with either of these logging modes, queries on the slaves were blocked by the replication SQL thread while trying to execute the affected statements. (Bug#34628)

Replication: Manually removing entries from the binary log index file on a replication master could cause the server to repeatedly send the same binary log file to slaves. (Bug#28421)

Cluster Replication: When expire_logs_days was set, the thread performing the purge of the log files could deadlock, causing all binary log operations to stop. (Bug#49536)

Within a stored routine, selecting the result of CONCAT_WS() with a routine parameter argument into a user variable could return incorrect results. (Bug#50096)

The IBMDB2I storage engine was missing from the i5os 64-bit distribution of MySQL 5.1.42. It is now included again. (Bug#50059)

EXPLAIN EXTENDED UNION ... ORDER BY caused a crash when the ORDER BY referred to a nonconstant or full-text function or a subquery. (Bug#49734)

The push_warning_printf() function was being called with an invalid error level MYSQL_ERROR::WARN_LEVEL_ERROR, causing an assertion failure. To fix the problem, MYSQL_ERROR::WARN_LEVEL_ERROR has been replaced by MYSQL_ERROR::WARN_LEVEL_WARN. (Bug#49638)

Some prepared statements could raise an assertion when re-executed. (Bug#49570)

A Valgrind error in make_cond_for_table_from_pred() was corrected. Thanks to Sergey Petrunya for the patch to fix this bug. (Bug#49506)

Valgrind warnings for CHECKSUM TABLE were corrected. (Bug#49465)

Specifying an index algorithm (such as BTREE) for SPATIAL or FULLTEXT indexes caused a server crash. These index types do not support algorithm specification, and it is not longer permitted to do so. (Bug#49250)

The optimizer sometimes incorrectly handled conditions of the form WHERE col_name='const1' AND col_name='const2'. (Bug#49199)

Execution of DECODE() and ENCODE() could be inefficient because multiple executions within a single statement reinitialized the random generator multiple times even with constant parameters. (Bug#49141)

MySQL 5.1 does not support 2-byte collation numbers, but did not check the number and crashed for out-of-range values. (Bug#49134)

With binary logging enabled, REVOKE ... ON {PROCEDURE|FUNCTION} FROM ... could cause a crash. (Bug#49119)

The LIKE operator did not work correctly when using an index for a ucs2 column. (Bug#49028)

check_key_in_view() was missing a DBUG_RETURN in one code branch, causing a crash in debug builds. (Bug#48995)

Several strmake() calls had an incorrect length argument (too large by one). (Bug#48983)

On Fedora 12, strmov() did not guarantee correct operation for overlapping source and destination buffer. Calls were fixed to use an overlap-safe version instead. (Bug#48866)

Incomplete reset of internal TABLE structures could cause a crash with eq_ref table access in subqueries. (Bug#48709)

Re-execution of a prepared statement could cause a server crash. (Bug#48508)

The error message for ER_UPDATE_INFO was subject to buffer overflow or truncation. (Bug#48500)

SHOW BINLOG EVENTS could fail with a error: Wrong offset or I/O error. (Bug#48357)

Valgrind warnings related to binary logging of LOAD DATA INFILE statements were corrected. (Bug#48340)

An aliasing violation in the C API could lead to a crash. (Bug#48284)

With one thread waiting for a lock on a table, if another thread dropped the table and created a new table with the same name and structure, the first thread would not notice that the table had been re-created and would try to used cached metadata that belonged to the old table but had been freed. (Bug#48157)

Queries containing GROUP BY ... WITH ROLLUP that did not use indexes could return incorrect results. (Bug#47650)

If an invocation of a stored procedure failed in the table-open stage, subsequent invocations that did not fail in that stage could cause a crash. (Bug#47649)

On Solaris, no stack trace was printed to the error log after a crash. (Bug#47391)

A crash occurred when a user variable that was assigned to a subquery result was used as a result field in a SELECT statement with aggregate functions. (Bug#47371)

The first execution of STOP SLAVE UNTIL stopped too early. (Bug#47210)

When the mysql client was invoked with the --vertical option, it ignored the --skip-column-names option. (Bug#47147)

It was possible for init_available_charsets() not to initialize correctly. (Bug#45058)

For a VARCHAR(N) column, ORDER BY BINARY(col_name) sorted using only the first N bytes of the column, even though column values could be longer than N bytes if they contained multibyte characters. (Bug#44131)

Comparison with NULL values sometimes did not produce a correct result. (Bug#42760)

The mysql_upgrade command would create three additional fields to the mysql.proc table (character_set_client, collation_connection, and db_collation), but did not populate the fields with correct values. This would lead to error messages reported during stored procedure execution. (Bug#41569)

When compressed MyISAM files were opened, they were always memory mapped, sometimes causing memory-swapping problems. To deal with this, a new system variable, myisam_mmap_size, was added to limit the amount of memory used for memory mapping of MyISAM files. (Bug#37408)

A race condition on the privilege hash tables permitted one thread to try to delete elements that had already been deleted by another thread. A consequence was that SET PASSWORD or FLUSH PRIVILEGES could cause a crash. (Bug#35589, Bug#35591)

ALTER TABLE with both DROP COLUMN and ADD COLUMN clauses could crash or lock up the server. (Bug#31145)

InnoDB Plugin has been upgraded to version 1.0.6. This version is considered of Release Candidate (RC) quality. InnoDB Plugin Change History, may contain information in addition to those changes reported here.

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on S/390, PowerPC, and generic ia64.

MySQL Server 5.1 is available on the following new platforms starting with the 5.1.42 release:

Performance: When the query cache is fragmented, the size of the free block lists in the memory bins grows, which causes query cache invalidation to become slow. There is now a 50ms timeout for a SELECT statement waiting for the query cache lock. If the timeout expires, the statement executes without using the query cache. (Bug#39253)

See also Bug#21074.

Important Change: Replication: The following functions have been marked unsafe for statement-based replication:

None of the functions just listed are guaranteed to replicate correctly when using the statement-based format, because they can produce different results on the master and the slave. The use of any of these functions while binlog_format is set to STATEMENT is logged with the warning, Statement is not safe to log in statement format. When binlog_format is set to MIXED, the binary logging format is automatically switched to the row-based format whenever one of these functions is used. (Bug#47995)

Partitioning: In some cases, it was not possible to add a new column to a table that had subpartitions. (Bug#48276)

Partitioning: SELECT COUNT(*) from a partitioned table failed when using the ONLY_FULL_GROUP_BY SQL mode. (Bug#46923)

This regression was introduced by Bug#45807.

Partitioning: SUBPARTITION BY KEY failed with DEFAULT CHARSET=utf8. (Bug#45904)

Replication: When using row-based logging, TRUNCATE TABLE was written to the binary log even if the affected table was temporary, causing replication to fail. (Bug#48350)

Replication: Replicating TEXT or VARCHAR columns declared as NULL on the master but NOT NULL on the slave caused the slave to crash. (Bug#43789)

See also Bug#38850, Bug#43783, Bug#43785, Bug#47741, Bug#48091.

Replication: When using row-based format, replication failed with the error Could not execute Write_rows event on table ...; Field '...' doesn't have a default value when an INSERT was made on the master without specifying a value for a column having no default, even if strict server SQL mode was not in use and the statement would otherwise have succeeded on the master. Now the SQL mode is checked, and the statement is replicated unless strict mode is in effect. For more information, see Section 5.1.7, “Server SQL Modes”. (Bug#38173)

See also Bug#38262, Bug#43992.

The result of comparison between nullable BIGINT and INT columns was inconsistent. (Bug#49517)

Incorrect cache initialization prevented storage of converted constant values and could produce incorrect comparison results. (Bug#49489)

Comparisons involving YEAR values could produce incorrect results. (Bug#49480)

See also Bug#43668.

If a query involving a table was terminated with KILL, a subsequent SHOW CREATE TABLE for that table caused a server crash. (Bug#48985)

Privileges for stored routines were ignored for mixed-case routine names. (Bug#48872)

See also Bug#41049.

Building MySQL on Fedora Core 12 64-bit failed, due to errors in comp_err. (Bug#48864)

Concurrent ALTER TABLE operations on an InnoDB table could raise an assertion. (Bug#48782)

Certain INTERVAL expressions could cause a crash on 64-bit systems. (Bug#48739)

During query execution, ranges could be merged incorrectly for OR operations and return an incorrect result. (Bug#48665)

The InnoDB Table Monitor reported the FLOAT and DOUBLE data types incorrectly. (Bug#48526)

With row-based binary logging, the server crashed for statements of the form CREATE TABLE IF NOT EXISTS existing_view LIKE temporary_table. This occurred because the server handled the existing view as a table when logging the statement. (Bug#48506)

DISTINCT was ignored for queries with GROUP BY WITH ROLLUP and only const tables. (Bug#48475)

Loose index scan was inappropriately chosen for some WHERE conditions. (Bug#48472)

The server could crash and corrupt the tablespace if the InnoDB tablespace was configured with too small a value, or if many CREATE TEMPORARY TABLE statements were executed and the temporary file directory filled up with innodb_file_per_table enabled. (Bug#48469)

Parts of the range optimizer could be initialized incorrectly, resulting in Valgrind errors. (Bug#48459)

A bad typecast could cause query execution to allocate large amounts of memory. (Bug#48458)

GRANT and REVOKE crashed if a user name was specified as CURRENT_USER(). (Bug#48319)

On Windows, InnoDB could not be built as a statically linked library. (Bug#48317)

mysql_secure_installation did not work on Solaris. (Bug#48086)

When running mysql_secure_installation, the command would fail if the root password contained multiple spaces, \, # or quote characters. (Bug#48031)

MATCH IN BOOLEAN MODE searches could return too many results inside a subquery. (Bug#47930)

Using REPLACE to update a previously inserted negative value in an AUTO_INCREMENT coumn in an InnoDB table caused the table auto-increment value to be updated to 2147483647. (Bug#47720)

If a session held a global read lock acquired with FLUSH TABLES WITH READ LOCK, a lock for one table acquired with LOCK TABLES, and issued an INSERT DELAYED statement for another table, deadlock could occur. (Bug#47682)

The mysql client status command displayed an incorrect value for the server character set. (Bug#47671)

Connecting to a 4.1.x server from a 5.1.x or higher mysql client resulted in a memory-free error when disconnecting. (Bug#47655)

Assignment of a system variable sharing the same base name as a declared stored program variable in the same context could lead to a crash. (Bug#47627)

mysqladmin debug could crash on 64-bit systems. (Bug#47382)

The innodb_file_format_check system variable could not be set at runtime to DEFAULT or to the value of a user-defined variable. (Bug#47167)

After a binary upgrade to MySQL 5.1 from a MySQL 5.0 installation that contains ARCHIVE tables, accessing those tables caused the server to crash, even if you had run mysql_upgrade or CHECK TABLE ... FOR UPGRADE.

To work around this problem, use mysqldump to dump all ARCHIVE tables before upgrading, and reload them into MySQL 5.1 after upgrading. The same problem occurs for binary downgrades from MySQL 5.1 to 5.0. (Bug#47012)

The Mac OS X MySQL Preference Pane component was not built for 64-bit, which would trigger the System Preferences application to restart into 32-bit mode. (Bug#46935)

The IGNORE clause on a DELETE statement masked an SQL statement error that occurred during trigger processing. (Bug#46425)

On 64-bit systems, --skip-innodb did not skip InnoDB startup. (Bug#46043)

Valgrind errors for InnoDB Plugin were corrected. (Bug#45992, Bug#46656)

The return value was not checked for some my_hash_insert() calls. (Bug#45613)

Truncation of DECIMAL values could lead to assertion failures; for example, when deducing the type of a table column from a literal DECIMAL value. (Bug#45261)

See also Bug#48370.

For YEAR(2) values, MIN(), MAX(), and comparisons could yield incorrect results. (Bug#43668)

The server could crash when attempting to access a non-conformant mysql.proc system table. For example, the server could crash when invoking stored procedure-related statements after an upgrade from MySQL 5.0 to 5.1 without running mysql_upgrade. (Bug#41726)

Multiple-statement execution could fail. (Bug#40877)

Use of InnoDB monitoring (SHOW ENGINE INNODB STATUS or one of the InnoDB Monitor tables) could cause a server crash due to invalid access to a shared variable in a concurrent environment. This is a further fix for a regression introduced in MySQL 5.1.38 to the original fix in MySQL 5.1.31. (Bug#38883)

When running mysql_secure_installation on Windows, the command would fail to load a required module, Term::ReadKey, which was required for correct operation. (Bug#35106)

If the --log-bin server option was set to a directory name with a trailing component separator character, the basename of the binary log files was empty so that the created files were named .000001 and .index. The same thing occurred with the --log-bin-index, --relay-log, and --relay-log-index options. Now the server reports and error and exits. (Bug#34739)

If a comparison involved a constant value that required type conversion, the converted value might not be cached, resulting in repeated conversion and poorer performance. (Bug#34384)

Using the SHOW ENGINE INNODB STATUS statement when using partitions in InnoDB tables caused Invalid (old?) table or database name errors to be logged. (Bug#32430)

On some Windows systems, InnoDB could report Operating system error number 995 in a file operation due to transient driver or hardware problems. InnoDB now retries the operation and adds Retry attempt is made to the error message. (Bug#3139)

InnoDB Plugin has been upgraded to version 1.0.5. This version is considered of Release Candidate (RC) quality. InnoDB Plugin Change History, may contain information in addition to those changes reported here.

The InnoDB buffer pool is divided into two sublists: A new sublist containing blocks that are heavily used by queries, and an old sublist containing less-used blocks and from which candidates for eviction are taken. In the default operation of the buffer pool, a block when read in is loaded at the midpoint and then moved immediately to the head of the new sublist as soon as an access occurs. In the case of a table scan (such as performed for a mysqldump operation), each block read by the scan ends up moving to the head of the new sublist because multiple rows are accessed from each block. This occurs even for a one-time scan, where the blocks are not otherwise used by other queries. Blocks may also be loaded by the read-ahead background thread and then moved to the head of the new sublist by a single access. These effects can be disadvantageous because they push blocks that are in heavy use by other queries out of the new sublist to the old sublist where they become subject to eviction.

InnoDB now provides two system variables that enable LRU algorithm tuning:

For additional information, see Section 7.6.2, “The InnoDB Buffer Pool”. (Bug#45015)

For InnoDB Plugin, two status variables have been added to SHOW STATUS output. Innodb_buffer_pool_read_ahead and Innodb_buffer_pool_read_ahead_evicted indicate the number of pages read in by the InnoDB read-ahead background thread, and the number of such pages evicted without ever being accessed, respectively. Also, the status variables Innodb_buffer_pool_read_ahead_rnd and Innodb_buffer_pool_read_ahead_seq status variables have been removed.

The built-in version of InnoDB is not affected by these changes. (Bug#42885)

The server now supports a Debug Sync facility for thread synchronization during testing and debugging. To compile in this facility, configure MySQL with the --enable-debug-sync option. The debug_sync system variable provides the user interface Debug Sync. mysqld and mysql-test-run.pl support a --debug-sync-timeout option to enable the facility and set the default synchronization point timeout.

Important Change: Security Fix: Additional corrections were made for the symlink-related privilege problem originally addressed in MySQL 5.1.24. The original fix did not correctly handle the data directory path name if it contained symlinked directories in its path, and the check was made only at table-creation time, not at table-opening time later. (Bug#32167, CVE-2008-2079)

See also Bug#39277.

Security Fix: MySQL clients linked against OpenSSL can be tricked not to check server certificates. (Bug#47320, CVE-2009-4028)

InnoDB Storage Engine: When a trigger inserts into a table containing an auto-increment column, an error Error: Duplicate entry could occur with the InnoDB Plugin if another insert was happening simultaneously. (Bug#26316)

Partitioning: An ALTER TABLE ... ADD PARTITION statement that caused open_files_limit to be exceeded led to a crash of the MySQL server. (Bug#46922)

See also Bug#47343.

Partitioning: The cardinality of indexes on partitioned tables was calculated using the first partition in the table, which could result in suboptimal query execution plans being chosen. Now the partition having the most records is used instead, which should result in better use of indexes and thus improved performance of queries against partitioned tables in many if not most cases. (Bug#44059)

Replication: This issue occurred in MySQL 5.1.40 only. (Bug#48297)

Replication: When a session was closed on the master, temporary tables belonging to that session were logged with the wrong database names when either of the following conditions was true:

(Bug#48216)

See also Bug#46861, Bug#48297.

Replication: When using row-based replication, changes to nontransactional tables that occurred early in a transaction were not immediately flushed upon committing a statement. This behavior could break consistency since changes made to nontransactional tables become immediately visible to other connections. (Bug#47678)

See also Bug#47287, Bug#46864, Bug#43929, Bug#46129.

Replication: When mysqlbinlog --verbose was used to read a binary log that had been recorded using the row-based format, the output for events that updated some but not all columns of tables was not correct. (Bug#47323)

Replication: When using the row-based format to replicate a transaction involving both transactional and nontransactional engines, which contained a DML statement affecting multiple rows, the statement failed; if this transaction was followed by a COMMIT, the master and the slave could diverge, because the statement was correctly rolled back on the master, but was applied on the slave. (Bug#47287)

See also Bug#46864.

Replication: A problem with the BINLOG statement in the output of mysqlbinlog could break replication; statements could be logged with the server ID stored within events by the BINLOG statement rather than the ID of the running server. With this fix, the server ID of the server executing the statements can no longer be overridden by the server ID stored in the binary log's format description statement. (Bug#46640)

This regression was introduced by Bug#32407.

Replication: When using statement-based replication and the transaction isolation level was set to READ COMMITTED or a less strict level, InnoDB returned an error even if the statement in question was filtered out according to the --binlog-do-db or --binlog-ignore-db rules in effect at the time. (Bug#42829)

Replication: FLUSH LOGS did not close and reopen the binary log index file. (Bug#34582)

See also Bug#48738.

SUM() artificially increased the precision of a DECIMAL argument, which was truncated when a temporary table was created to hold the results. (Bug#48370)

See also Bug#45261.

If an outer query was invalid, a subquery might not even be set up. EXPLAIN EXTENDED did not expect this and caused a crash by trying to dereference improperly set up information. (Bug#48295)

A query containing a view using temporary tables and multiple tables in the FROM clause and PROCEDURE ANALYSE() caused a server crash.

As a result of this bug fix, PROCEDURE ANALYSE() is legal only in a top-level SELECT. (Bug#48293)

See also Bug#46184.

Error handling was missing for SELECT statements containing subqueries in the WHERE clause and that assigned a SELECT result to a user variable. The server could crash as a result. (Bug#48291)

An assertion could fail if the optimizer used a SPATIAL index. (Bug#48258, Bug#47019)

Memory-allocation failures were handled incorrectly in the InnoDB os_mem_alloc_large() function. (Bug#48237)

WHERE clauses with outer_value_list NOT IN subquery were handled incorrectly if the outer value list contained multiple items at least one of which could be NULL. (Bug#48177)

A combination of GROUP BY WITH ROLLUP, DISTINCT and the const join type in a query caused a server crash when the optimizer chose to employ a temporary table to resolve DISTINCT. (Bug#48131)

In some cases, using a null microsecond part in a WHERE condition (for example, WHERE date_time_field <= 'YYYY-MM-DD HH:MM:SS.0000') could lead to incorrect results due to improper DATETIME comparison. (Bug#47963)

A build configured using the --without-server option did not compile the yaSSL code, so if --with-ssl was also used, the build failed. (Bug#47957)

When a query used a DATE or DATETIME value formatted using any separator characters other than hyphen ('-') and a >= condition matching only the greatest value in an indexed column, the result was empty if an index range scan was employed. (Bug#47925)

mysys/mf_keycache.c requires threading, but no test was made for thread support. (Bug#47923)

For debug builds, an assertion could fail during the next statement executed for a temporary table after a multiple-table UPDATE involving that table and modified an AUTO_INCREMENT column with a user-supplied value. (Bug#47919)

The mysys/mf_strip.c file, which defines the strip_sp() function, has been removed from the MySQL source. The function was no longer used within the main build, and the supplied function was causing symbol errors on Windows builds. (Bug#47857)

The Windows build for MySQL would compile the split.c and debug.c files unnecessarily, causing additional symbols to be included in mysqld. (Bug#47850)

When building storage engines on Windows it was not possible to specify additional libraries within the CMake file required for the build. An ${engine}_LIBS macro has been included in the files to support these additional storage-engine specific libraries. (Bug#47797)

When building a pluggable storage engine on Windows, the engine name could be based on the directory name where the engine was located, rather than the configured storage engine name. (Bug#47795)

During cleanup of a stored procedure's internal structures, the flag to ignore the errors for INSERT IGNORE or UPDATE IGNORE was not cleaned up, which could result in a server crash. (Bug#47788)

If the first argument to GeomFromWKB() function was a geometry value, the function just returned its value. However, it failed to preserve the argument's null_value flag, which caused an unexpected NULL value to be returned to the caller, resulting in a server crash. (Bug#47780)

InnoDB could crash when updating spatial values. (Bug#47777)

On WIndows, when an idle named pipe connection was forcibly closed with a KILL statement or because the server was being shut down, the thread that was closing the connection would hang infinitely. (Bug#47571, Bug#31621)

A function call could end without throwing an error or setting the return value. For example, this could happen when an error occurred while calculating the return value. This is fixed by setting the value to NULL when an error occurs during evaluation of an expression. (Bug#47412)

A simple SELECT with implicit grouping could return many rows rather than a single row if the query was ordered by the aggregated column in the select list. (Bug#47280)

An assertion could be raised for CREATE TABLE if there was a pending INSERT DELAYED or REPLACE DELAYED for the same table. (Bug#47274)

InnoDB raised errors in some cases in a manner not compatible with SIGNAL and RESIGNAL. (Bug#47233)

If an InnoDB table was created with the AUTO_INCREMENT table option to specify an initial auto-increment value, and an index was added in a separate operation later, the auto-increment value was lost (subsequent inserts began at 1 rather than the specified value). (Bug#47125)

Incorrect handling of predicates involving NULL by the range optimizer could lead to an infinite loop during query execution. (Bug#47123)

Repair by sort or parallel repair of MyISAM tables could fail to fail over to repair with key cache. (Bug#47073)

InnoDB Plugin did not compile on some Solaris systems. (Bug#47058)

On WIndows, when a failed I/O operation occurred with return code of ERROR_WORKING_SET_QUOTA, InnoDB intentionally crashed the server. Now InnoDB sleeps for 100ms and retries the failed operation. (Bug#47055)

InnoDB now ignores negative values supplied by a user for an AUTO_INCREMENT column when calculating the next value to store in the data dictionary. Setting AUTO_INCREMENT columns to negative values is undefined behavior and this change should bring the behavior of InnoDB closer to what users expect. (Bug#46965)

When MySQL crashed (or a snapshot was taken that simulates a crash), it was possible that internal XA transactions (used to synchronize the binary log and InnoDB) could be left in a PREPARED state, whereas they should be rolled back. This occurred when the server_id value changed before the restart, because that value was used to construct XID values.

Now the restriction is relaxed that the server_id value be consistent for XID values to be considered valid. The rollback phase should then be able to clean up all pending XA transactions. (Bug#46944)

InnoDB Plugin did not compile using gcc 4.1 on PPC systems. (Bug#46718)

If InnoDB Plugin reached its limit on the number of concurrent transactions (1023), it wrote a descriptive message to the error log but returned a misleading error message to the client, or an assertion failure occurred. (Bug#46672)

See also Bug#18828.

A Valgrind error during index creation by InnoDB Plugin was corrected. (Bug#46657)

Concurrent INSERT INTO ... SELECT statements for an InnoDB table could cause an AUTO_INCREMENT assertion failure. (Bug#46650)

If a transaction was rolled back inside InnoDB due to a deadlock or lock wait timeout, and a statement in the transaction had an IGNORE clause, the server could crash at the end of the statement or on shutdown. (Bug#46539)

Trailing spaces were not ignored for user-defined collations that mapped spaces to a character other than 0x20. (Bug#46448)

See also Bug#29468.

The GPL and commercial license headers had different sizes, so that error log, backtrace, core dump, and cluster trace file line numbers could be off by one if they were not checked against the version of the source used for the build. (For example, checking a GPL build backtrace against commercial sources.) (Bug#46216)

InnoDB did not disallow creation of an index with the name GEN_CLUST_INDEX, which is used internally. (Bug#46000)

During the build of the Red Hat IA64 MySQL server RPM, the system library link order was incorrect. This made the resulting Red Hat IA64 RPM depend on "libc.so.6.1(GLIBC_PRIVATE)(64bit)", thus preventing installation of the package. (Bug#45706)

The caseinfo member of the CHARSET_INFO structure was not initialized for user-defined Unicode collations, leading to a server crash. (Bug#45645)

With InnoDB Plugin, renaming a table column and then creating an index on the renamed column caused a server crash to the .frm file and the InnoDB data directory going out of sync. Now InnoDB Plugin 1.0.5 returns an error instead: ERROR 1034 (HY000): Incorrect key file for table 'tbl_name'; try to repair it. To work around the problem, create another table with the same structure and copy the original table to it. (Bug#44571)

An InnoDB error message incorrectly referred to the nonexistent innodb_max_files_open variable rather than to innodb_open_files. (Bug#44338)

For ALTER TABLE, renaming a DATETIME or TIMESTAMP column unnecessarily caused a table copy operation. (Bug#43508)

The weekday names for the Romanian lc_time_names locale 'ro_RO' were incorrect. Thanks to Andrei Boros for the patch to fix this bug. (Bug#43207)

XA START could cause an assertion failure or server crash when it is called after a unilateral rollback issued by the Resource Manager (both in a regular transaction and after an XA transaction). (Bug#43171)

The FORCE INDEX FOR ORDER BY index hint was ignored when join buffering was used. (Bug#43029)

Incorrect handling of range predicates combined with OR operators could yield incorrect results. (Bug#42846)

Failure to treat BIT values as unsigned could lead to unpredictable results. (Bug#42803)

For the embedded server on Windows, InnoDB crashed when innodb_file_per_table was enabled and a table name was in full path format. (Bug#42383)

Some queries with nested outer joins could lead to crashes or incorrect results because an internal data structure was handled improperly. (Bug#42116)

In a replication scenario with innodb_locks_unsafe_for_binlog enabled on the slave, where rows were changed only on the slave (not through replication), in some rare cases, many messages of the following form were written to the slave error log: InnoDB: Error: unlock row could not find a 4 mode lock on the record. (Bug#41756)

After renaming a user, granting that user privileges could result in the user having additional privileges other than those granted. (Bug#41597)

With a nonstandard InnoDB page size, some error messages became inaccurate.

(Bug#41490)

In some cases, the server did not recognize lettercase differences between GRANT attributes such as table name or user name. For example, a user was able to perform operations on a table with privileges of another user with the same user name but in a different lettercase.

In consequence of this bug fix, the collation for the Routine_name column of the mysql.proc table is changed from utf8_bin to utf8_general_ci. (Bug#41049)

See also Bug#48872.

Simultaneous ANALYZE TABLE operations for an InnoDB tables could be subject to a race condition. (Bug#38996)

Previously, InnoDB performed REPLACE INTO T SELECT ... FROM S WHERE ... by setting shared next-key locks on rows from S. Now InnoDB selects rows from S with shared locks or as a consistent read, as for INSERT ... SELECT. This reduces lock contention between sessions. (Bug#37232)

When an InnoDB tablespace filled up, an error was logged to the client, but not to the error log. Also, the error message was misleading and did not indicate the real source of the problem. (Bug#31183)

In mysql, using Control-C to kill the current query resulted in a ERROR 1053 (08S01): Server shutdown in progress" message if the query was waiting for a lock. (Bug#28141)

Replication: When using statement-based or mixed-format replication, the database name was not written to the binary log when executing a LOAD DATA statement. This caused problems when the table being loaded belonged to a database other than the current database; data could be loaded into the wrong table (if a table having the same name existed in the current database) or replication could fail (if no table having that name existed in the current database). Now a table referenced in a LOAD DATA statement is always logged using its fully qualified name when the database to which it belongs is not the current database. (Bug#48297)

Replication: When a session was closed on the master, temporary tables belonging to that session were logged with the wrong database names when either of the following conditions was true:

(Bug#48216)

See also Bug#46861, Bug#48297.

SUM() artificially increased the precision of a DECIMAL argument, which was truncated when a temporary table was created to hold the results. (Bug#48370)

See also Bug#45261.

If an outer query was invalid, a subquery might not even be set up. EXPLAIN EXTENDED did not expect this and caused a crash by trying to dereference improperly set up information. (Bug#48295)

A query containing a view using temporary tables and multiple tables in the FROM clause and PROCEDURE ANALYSE() caused a server crash.

As a result of this bug fix, PROCEDURE ANALYSE() is legal only in a top-level SELECT. (Bug#48293)

See also Bug#46184.

Error handling was missing for SELECT statements containing subqueries in the WHERE clause and that assigned a SELECT result to a user variable. The server could crash as a result. (Bug#48291)

An assertion could fail if the optimizer used a SPATIAL index. (Bug#48258, Bug#47019)

A combination of GROUP BY WITH ROLLUP, DISTINCT and the const join type in a query caused a server crash when the optimizer chose to employ a temporary table to resolve DISTINCT. (Bug#48131)

In some cases, using a null microsecond part in a WHERE condition (for example, WHERE date_time_field <= 'YYYY-MM-DD HH:MM:SS.0000') could lead to incorrect results due to improper DATETIME comparison. (Bug#47963)

When a query used a DATE or DATETIME value formatted using any separator characters other than hyphen ('-') and a >= condition matching only the greatest value in an indexed column, the result was empty if an index range scan was employed. (Bug#47925)

During cleanup of a stored procedure's internal structures, the flag to ignore the errors for INSERT IGNORE or UPDATE IGNORE was not cleaned up, which could result in a server crash. (Bug#47788)

If the first argument to GeomFromWKB() function was a geometry value, the function just returned its value. However, it failed to preserve the argument's null_value flag, which caused an unexpected NULL value to be returned to the caller, resulting in a server crash. (Bug#47780)

InnoDB could crash when updating spatial values. (Bug#47777)

Incorrect handling of predicates involving NULL by the range optimizer could lead to an infinite loop during query execution. (Bug#47123)

InnoDB now ignores negative values supplied by a user for an AUTO_INCREMENT column when calculating the next value to store in the data dictionary. Setting AUTO_INCREMENT columns to negative values is undefined behavior and this change should bring the behavior of InnoDB closer to what users expect. (Bug#46965)

In a replication scenario with innodb_locks_unsafe_for_binlog enabled on the slave, where rows were changed only on the slave (not through replication), in some rare cases, many messages of the following form were written to the slave error log: InnoDB: Error: unlock row could not find a 4 mode lock on the record. (Bug#41756)

In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages. It also does not work for FreeBSD 6 and HP-UX or for Linux on S/390, PowerPC, and generic ia64.

Incompatible Change: In binary installations of MySQL, the supplied binary-configure script would start and configure MySQL, even when command help was requested with the --help command-line option. The --help, if provided, will no longer start and install the server. (Bug#30954)

Partitioning: When reorganizing partitions, not all affected subpartitions were removed prior to renaming. One way in which the issue was visible was that attempting to reorganize two partitions into a single partition having the same name as one of the original partitions could lead to a crash of the server. (Bug#47029)

See also Bug#45961, Bug#43729.

Partitioning: An online or fast ALTER TABLE of a partitioned table could leave behind temporary files in the database directory.

This issue was observed in MySQL 5.1.31 and later only. (Bug#46483)

Partitioning: When performing an INSERT ... SELECT into a partitioned table, read_buffer_size bytes of memory were allocated for every partition in the target table, resulting in consumption of large amounts of memory when the table had many partitions (more than 100).

This fix changes the method used to estimate the buffer size required for each partition and limits the total buffer size to a maximum of approximately 10 times read_buffer_size. (Bug#45840)

Partitioning: Inserting negative values into an AUTO_INCREMENT column of a partitioned table could lead to apparently unrelated errors or a crash of the server. (Bug#45823)

Partitioning: Unnecessary calls were made in the server code for performing bulk inserts on partitions for which no inserts needed to be made. (Bug#35845)

See also Bug#35843.

Replication: Performing ALTER TABLE ... DISABLE KEYS on a slave table caused row-based replication to fail. (Bug#47312)

Replication: BEGIN statements were not included in the output of mysqlbinlog. (Bug#46998)

Replication: When using row-based replication, DROP TEMPORARY TABLE IF EXISTS was written to the binary log if the table named in the statement did not exist, even though a DROP TEMPORARY TABLE statement should never be logged in row-based logging mode, whether the table exists or not. (Bug#46572)

Replication: When using row-based replication, importing a dump made with mysqldump and replicating a row with an AUTO_INCREMENT column set to 0, with NO_AUTO_VALUE_ON_ZERO active on the master, the row was inserted successfully on the master; however any setting for NO_AUTO_VALUE_ON_ZERO was ignored on the slave. When the AUTO_INCREMENT column was incremented, this caused replication to fail on the slave due to a duplicate key error. In some cases it could also cause the slave to crash. (Bug#45999)

Replication: Concurrent transactions that inserted rows into a table with an AUTO_INCREMENT column could break statement-based or mixed-format replication error 1062 Duplicate entry '...' for key 'PRIMARY' on the slave. This was especially likely to happen when one of the transactions activated a trigger that inserted rows into the table with the AUTO_INCREMENT column, although other conditions could also cause the issue to manifest. (Bug#45677)

Replication: By default, all statements executed by the mysql_upgrade program on the master are written to the binary log, then replicated to the slave. In some cases, this can result in problems; for example, it attempted to alter log tables on replicated databases (this failed due to logging being enabled).

As part of this fix, a mysql_upgrade option, --write-binlog, is added. Its inverse, --skip-write-binlog, can be used to disable binary logging while the upgrade is in progress. (Bug#43579)

Replication: On the master, if a binary log event is larger than max_allowed_packet, the error message ER_MASTER_FATAL_ERROR_READING_BINLOG is sent to a slave when it requests a dump from the master, thus leading the I/O thread to stop. On a slave, the I/O thread stops when receiving a packet larger than max_allowed_packet.

In both cases, however, there was no Last_IO_Error reported, which made it difficult to determine why the slave had stopped in such cases. Now, Last_IO_Error is reported when max_allowed_packet is exceeded, and provides the reason for which the slave I/O thread stopped. (Bug#42914)

See also Bug#14068, Bug#47200, Bug#47303.

API: The fix for Bug#24507 could lead in some cases to client application failures due to a race condition. Now the server waits for the “dummy” thread to return before exiting, thus making sure that only one thread can initialize the POSIX threads library. (Bug#42850)

The pthread_cond_wait() implementations for Windows could deadlock in some rare circumstances. (Bug#47768)

On Mac OS X or Windows, sending a SIGHUP signal to the server or an asynchronous flush (triggered by flush_time) caused the server to crash. (Bug#47525)

Debug builds could not be compiled with the Sun Studio compiler. (Bug#47474)

A multiple-table UPDATE involving a natural join and a mergeable view raised an assertion. (Bug#47150)

Solaris binary packages now are compiled with -g0 rather than -g. (Bug#47137)

EXPLAIN caused a server crash for certain valid queries. (Bug#47106)

The configure option --without-server did not work. (Bug#46980)

The ARCHIVE storage engine lost records during a bulk insert. (Bug#46961)

Failed multiple-table DELETE statements could raise an assertion. (Bug#46958)

When creating a new instance on Windows using mysqld-nt and the --install parameter, the value of the service would be set incorrectly, resulting in a failure to start the configured service. (Bug#46917)

CONCAT_WS() could return incorrect results due to an argument buffer also being used as a result buffer. (Bug#46815)

The server crashed when re-using outer column references in correlated subqueries when the enclosing query used a temp table. (Bug#46791)

For InnoDB tables, an unnecessary table rebuild for ALTER TABLE could sometimes occur for metadata-only changes. (Bug#46760)

Assertion failure could result from repeated execution of a stored procedure containing an incorrect query with a subselect. (Bug#46629)

The server ignored the setting of sync_frm for CREATE TABLE ... LIKE. (Bug#46591)

An attempt to create a table with the same name as an existing view could cause a server crash. (Bug#46384)

A parser problem prevented properly stripping backquotes from an argument to a user-defined function (UDF). If the UDF was in an ORDER BY clause, its name would not be properly resolved against an alias with the same name in the select list. (Bug#46259)

Dropping an InnoDB table that used an unknown collation (created on a different server, for example) caused a server crash. (Bug#46256)

Certain SELECT statements containing DISTINCT, GROUP BY, and HAVING clauses could hang in an infinite loop. (Bug#46159)

InnoDB did not disallow creation of an index with the name GEN_CLUST_INDEX, which is used internally. (Bug#46000)

CREATE TEMPORARY TABLE failed for InnoDB tables on systems with case-insensitive file systems when lower_case_table_names = 2 and the pathname of the temporary file directory contained uppercase characters. (Bug#45638)

Appending values to an ENUM or SET definition is a metadata change for which ALTER TABLE need not rebuild the table, but it was being rebuilt anyway. (Bug#45567)

The socket system variable was unavailable on Windows. (Bug#45498)

When re-installing MySQL on Windows on a server that has a data directory from a previous MySQL installation, the installer would fail to identify the existence of the installation and the password configured for the root user. (Bug#45200)

Client flags were incorrectly initialized for the embedded server, causing several tests in the jp test suite to fail. (Bug#45159)

InnoDB did not always disallow creating tables containing columns with names that match the names of internal columns, such as DB_ROW_ID, DB_TRX_ID, DB_ROLL_PTR, and DB_MIX_ID. (Bug#44369)

SELECT ... WHERE ... IN (NULL, ...) was executed using a full table scan, even if the same query without the NULL used an efficient range scan. (Bug#44139)

See also Bug#18360.

InnoDB use of SELECT MAX(autoinc_column) could cause a crash when MySQL data dictionaries went out of sync. (Bug#44030)

LOAD DATA INFILE statements were written to the binary log in such a way that parsing problems could occur when re-executing the statement from the log. (Bug#43746)

Selecting from the process list in the embedded server caused a crash. (Bug#43733)

See also Bug#47304.

Attempts to enable large_pages with a shared memory segment larger than 4GB caused a server crash. (Bug#43606)

A test for stack growth failed on some platforms, leading to server crashes. (Bug#42213)

The server used the wrong lock type (always TL_READ instead of TL_READ_NO_INSERT when appropriate) for tables used in subqueries of UPDATE statements. This led in some cases to replication failure because statements were written in the wrong order to the binary log. (Bug#42108)

The mysql-stress-test.pl test script was missing from the noinstall packages on Windows. (Bug#41546)

Privileges for SHOW CREATE VIEW were not being checked correctly. (Bug#35996)

Different invocations of CHECKSUM TABLE could return different results for a table containing columns with spatial data types. (Bug#35570)

Concurrent execution of FLUSH TABLES along with SHOW FUNCTION STATUS or SHOW PROCEDURE STATUS could cause a server crash. (Bug#34895)

myisamchk performed parameter value casting at startup that generated unnecessary warning messages. (Bug#33785)

When using the ARCHIVE storage engine, SHOW TABLE STATUS displayed incorrect information for Max_data_length, Data_length and Avg_row_length. (Bug#29203)

When building MySQL on Windows from source, the WITH_BERKELEY_STORAGE_ENGINE option would fail to configure BDB support correctly. (Bug#27693)

Performance: For MyISAM tables with bulk_insert_buffer_size values larger than 256KB, the performance of bulk insert operations such as multiple-row INSERT and INSERT ... SELECT operations has been improved greatly when up to a hundred rows are inserted at the same time. (Bug#44723)

Partitioning: An INSERT ... SELECT statement on an empty partition of a partitioned table failed with ERROR 1030 (HY000): Got error 124 from storage engine. This issue also caused queries run against a partitioned table while a LOAD DATA CONCURRENT INFILE statement was in progress to fail with the same error. (Bug#46639)

See also Bug#35845, Bug#44657, Bug#45840.

Partitioning: A partitioned table having a TIMESTAMP column with a default value of CURRENT_TIMESTAMP and this column was not defined using an ON UPDATE option, an ALTER TABLE ... REORGANIZE PARTITION statement on the table caused the TIMESTAMP column value to be set to CURRENT_TIMESTAMP regardless. (Bug#46478)

Partitioning: Partition pruning did not always work correctly when the table's partitioning key used the TO_DAYS() function. (Bug#46362)

Partitioning: Attempting to access a partitioned table when partitioning support was disabled in a MySQL server binary that had been compiled with partitioning support caused the server to crash. (Bug#39893)

Partitioning: The use of TO_DAYS() in the partitioning expression led to selection failures when the column having the date value contained invalid dates. This occurred because the function returns NULL in such cases, and the partition containing NULL values was pruned away. For example, this problem occurred if '2001-02-00' was inserted into a DATE column of such a table, and a subsequent query on this table used WHERE date_col < '2001-02-00'—while '2001-01-01' is less than '2001-02-00', TO_DAYS('2001-02-00') evaluates as NULL, and so the row containing '2001-01-01' was not returned. Now, for tables using RANGE or LIST partitioning and having TO_DAYS() in the partitioning expression, the NULL partition is also scanned instead of being ignored.

The fix for this issue also corrects misbehavior such that a query of the form SELECT * FROM table WHERE date_col < date_val on a table partitioned by RANGE or LIST was handled as though the server SQL mode included ALLOW_INVALID_DATES even if this was not actually part of the server SQL mode at the time the query was issued. (Bug#20577)

See also Bug#18198, Bug#32021, Bug#46362.

Replication: Performing a multi-row update of the AUTO_INCREMENT column of a transactional table could result in an inconsistency between master and slave when there was a trigger on the transactional table that updated a nontransactional table. When such an update failed on the master, no rows were updated on the master, but some rows could (erroneously) be updated on the slave. (Bug#46864)

Replication: When using the --replicate-rewrite-db option and the database referenced by this option on the master was the current database when the connection to the slave was closed, any temporary tables existing in this database were not properly dropped. (Bug#46861)

Replication: When a statement that changed both transactional and nontransactional tables failed, the transactional changes were automatically rolled back on the master but the slave ignored the error and did not roll them back, thus leading to inconsistencies between master and slave.

This issue is fixed by automatically rolling back a statement that fails on the slave; however, the transaction is not rolled back unless a corresponding ROLLBACK statement is found in the relay log file. (Bug#46130)

See also Bug#33864.

Replication: When slave_transaction_retries is set, a statement that replicates, but is then rolled back due to a deadlock on the slave, should be retried. However, in certain cases, replication was stopped with error 1213 (Deadlock found when trying to get lock; try restarting transaction) instead, even when this variable was set. (Bug#45694)

Replication: The binary logging behavior (and thus, the replication behavior) of CREATE DATABASE IF NOT EXISTS, CREATE TABLE IF NOT EXISTS, and CREATE EVENT IF NOT EXISTS was not consistent among these statements, nor with that of DROP DATABASE IF EXISTS, DROP TABLE IF EXISTS, and DROP EVENT IF EXISTS: A DROP ... IF EXISTS statement is always logged even if the database object named in the statement does not exist. However, of the CREATE ... IF NOT EXISTS statements, only the CREATE EVENT IF NOT EXISTS statement was logged when the database object named in the statement already existed.

Now, every CREATE ... IF NOT EXISTS statement is written to the binary log (and thus replicated), whether the database object named in the statement exists or not. For more information, see Section 16.4.1.3, “Replication of CREATE ... IF NOT EXISTS Statements”.

Exception. Replication and logging of CREATE TABLE IF NOT EXISTS ... SELECT continues to be handled according to existing rules. See Section 16.4.1.4, “Replication of CREATE TABLE ... SELECT Statements”, for more information.

(Bug#45574)

Replication: When using statement-based replication, database-level character sets were not always honored by the replication SQL thread. This could cause data inserted on the master using LOAD DATA to be replicated using the wrong character set.

(Bug#45516)

Replication: In some cases, a STOP SLAVE statement could cause the replication slave to crash. This issue was specific to MySQL on Windows or Macintosh platforms. (Bug#45238, Bug#45242, Bug#45243, Bug#46013, Bug#46014, Bug#46030)

See also Bug#40796.

Replication: Creating a scheduled event whose DEFINER clause was either set to CURRENT_USER or not set explicitly caused the master and the slave to become inconsistent. This issue stems from the fact that, in both cases, the DEFINER is set to the CURRENT_USER of the current thread. (On the master, the CURRENT_USER is the mysqld user; on the slave, the CURRENT_USER is empty.)

This behavior has been modified as follows:

(Bug#44331)

See also Bug#42217.

Replication: When using the statement-based logging format, the only possible safe combination of transactional and nontransactional statements within the same transaction is to perform any updates on nontransactional tables (such as MyISAM tables) first, before updating any transactional tables (such as those using the InnoDB storage engine). This is due to the fact that, although a modification made to a nontransactional table is immediately visible to other connections, the update is not immediately written to the binary log, which can lead to inconsistencies between master and slave. (Other combinations may hide a causal dependency, thus making it impossible to write statements updating nontransactional tables to the binary log in the correct order.)

However, in some cases, this situation was not handled properly, and the determination whether a given statement was safe or not under these conditions was not always correct. In particular, a multi-table update that affected both transactional and nontransactional tables or a statement modifying data in a nontransactional table having a trigger that operated on a transactional table (or the reverse) was not determined to be unsafe when it should have been.

With this fix, the following determinations regarding replication safety are made when combining updates to transactional and nontransactional tables within the same transaction in statement-based logging mode:

(Bug#28976)

Stack overflow checking did not account for the size of the structure stored in the heap. (Bug#46807)

The server could crash for queries with the following elements: 1. An “impossible where” in the outermost SELECT; 2. An aggregate in the outermost SELECT; 3. A correlated subquery with a WHERE clause that includes an outer field reference as a top-level WHERE sargable predicate; (Bug#46749)

CREATE TABLE ... SELECT could cause assertion failure if a table already existed with the same name and contained an AUTO_INCREMENT column. (Bug#46616)

SHOW CREATE TRIGGER for a MERGE table trigger caused an assertion failure. (Bug#46614)

In queries for which the loose index scan access method was chosen, using a condition of the form col_name rather than the equivalent col_name <> 0 caused an assertion failure. (Bug#46607)

TRUNCATE TABLE for a table that was opened with HANDLER did not close the handler and left it in an inconsistent state that could lead to a server crash. Now TRUNCATE TABLE for a table closes all open handlers for the table. (Bug#46456)

A query containing a subquery in the FROM clause and PROCEDURE ANALYSE() caused a server crash. (Bug#46184)

See also Bug#48293.

Killing a query that was performing a sort could result in a memory leak. (Bug#45962)

Truncation of DECIMAL values could lead to assertion failures; for example, when deducing the type of a table column from a literal DECIMAL value. (Bug#45261)

See also Bug#48370.

A buffer overflow could occur during handling of IS NULL ranges. (Bug#37044)

mysqladmin --wait ping crashed on Windows systems. (Bug#35132)

Installation of MySQL on Windows would fail to set the correct location for the character set files, which could lead to mysqld and mysql failing to initialize properly. (Bug#17270)

As of MySQL 5.1.38, the InnoDB Plugin is included in MySQL 5.1 releases, in addition to the built-in version of InnoDB that has been included in previous releases. The version of the InnoDB Plugin in this release is 1.0.4 and is considered of Beta quality.

The InnoDB Plugin offers new features, improved performance and scalability, enhanced reliability and new capabilities for flexibility and ease of use. Among the features of the InnoDB Plugin are “Fast index creation,” table and index compression, file format management, new INFORMATION_SCHEMA tables, capacity tuning, multiple background I/O threads, and group commit.

For information about these features, see InnoDB Plugin 1.0 for MySQL 5.1 User’s Guide. For general information about using InnoDB in MySQL, see Section 13.6, “The InnoDB Storage Engine”.

The InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages.

For instructions on replacing the built-in version of InnoDB with InnoDB Plugin, see Section 13.6.2.1, “Using InnoDB Plugin Instead of the Built-In InnoDB”.

Replication: With statement-based logging (SBL), repeatedly calling statements that are unsafe for SBL caused a warning message to be written to the error log for each statement, and there was no way to disable this behavior. Now the server logs messages about statements that are unsafe for statement-based logging only if the log_warnings variable is greater than 0. (Bug#46265)

The undocumented TRANSACTIONAL and PAGE_CHECKSUM keywords were removed from the grammar. (Bug#45829)

Previously, mysqldump would not dump the INFORMATION_SCHEMA database and ignored it if it was named on the command line. Now, mysqldump will dump INFORMATION_SCHEMA if it is named on the command line. Currently, this requires that the --skip-lock-tables (or --skip-opt) option be given. (Bug#33762)

Previously, SELECT ... INTO OUTFILE dumped column values without character set conversion, which could produce data files that cannot be imported without error if different columns used different character sets. A consequence of this is that mysqldump ignored the --default-character-set option if the --tab option was given (which causes SELECT ... INTO OUTFILE to be used to dump data.)

INTO OUTFILE now can be followed by a CHARACTER SET clause indicating the character set to which dumped values should be converted. Also, mysqldump adds a CHARACTER SET clause to the SELECT ... INTO OUTFILE statement used to dump data, so that --default-character-set is no longer ignored if --tab is given.

Other changes are that SELECT ... INTO OUTFILE enforces that ENCLOSED BY and ESCAPED BY arguments must be a single character, and SELECT ... INTO OUTFILE and LOAD DATA INFILE produce warnings if non-ASCII field or line separators are specified. (Bug#30946)

Pluggable storage engines now can be built for Windows.

The MySQL euckr character set now can store extended codes [81...FE][41..5A,61..7A,81..FE], which makes euckr compatible with the Microsoft cp949 character set.

Performance: The table cache lock (LOCK_open) is now an adaptive mutex, which should improve performance in workloads where this lock is heavily contended. (Bug#43435)

Partitioning: Attempting to create a table using an invalid or inconsistent subpartition definition caused the server to crash. An example of such a statement is shown here:

CREATE TABLE t2 (s1 INT, s2 INT)
PARTITION BY LIST (s1) SUBPARTITION BY HASH (s2) SUBPARTITIONS 1
(
    PARTITION p1 VALUES IN (1),
    PARTITION p2 VALUES IN (2) (SUBPARTITION p3)  
);

(Bug#46354)

Partitioning: When using a debug build of MySQL, if a query against a partitioned table having an index on one or more DOUBLE columns used that index, the server failed with an assertion. (Bug#45816)

Partitioning: A failed RENAME TABLE operation on a table with user-defined partitioning left the table in an unusable state, due to only some of the table files having been renamed. (Bug#30102)

Replication: When a statement that changes a nontransactional table failed, the transactional cache was flushed, causing a mismatch between the execution and logging histories. Now we avoid flushing the transactional cache unless a COMMIT or ROLLBACK is issued. (Bug#46129)

Replication: The internal function get_master_version_and_clock() (defined in sql/slave.cc) ignored errors and passed directly when queries failed, or when queries succeeded but the result retrieved was empty. Now this function tries to reconnect the master if a query fails due to transient network problems, and to fail otherwise. The I/O thread now prints a warning if the same system variables do not exist on master (in the event the master is a very old version of MySQL, compared to the slave.) (Bug#45214)

Replication: When using the MIXED logging format, after creating a temporary table and performing an update that switched the logging format to ROW, the format switch persisted following the update. This prevented any subsequent DDL statements on temporary tables from being written to the binary log until the temporary table was dropped. (Bug#43046)

See also Bug#40013.

This regression was introduced by Bug#20499.

Replication: If the --log-bin-trust-function-creators option is not enabled, CREATE FUNCTION requires one of the modifiers DETERMINISTIC, NO SQL, or READS SQL DATA. When using statement-based mode, the execution of a stored function should follow the same rules; however, only functions defined with DETERMINISTIC could actually be executed. In addition, the wrong error was generated (ER_BINLOG_ROW_RBR_TO_SBR instead of ER_BINLOG_UNSAFE_ROUTINE).

Now execution of stored functions is compatible with creation in this regard; when a stored function without one of the modifiers above is executed in STATEMENT mode, the correct error is raised, and functions defined using NO SQL, READS SQL DATA, or both (that is, without using DETERMINISTIC) can be excuted. (Bug#41166)

The test suite was missing from RPM packages. (Bug#46834)

Incorrect index optimization could lead to incorrect results or server crashes. (Bug#46454)

The server printed warnings at startup about adjusting the value of the max_join_size system variable. (These were harmless, but might be seen by users as significant.) (Bug#46385)

mysql did not handle backspace properly for multi-byte characters. This has been fixed now if mysql is linked with the readline library. It is not fixed if mysql is linked with libedit, which does not contain the necessary support for multi-byte character sets. (Bug#46310)

After an error such as a table-full condition, INSERT IGNORE could cause an assertion failure for debug builds. (Bug#46075)

An optimization that moved an item from a subquery to an outer query could cause a server crash. (Bug#46051)

Several Valgrind warnings were corrected. (Bug#46003, Bug#46034, Bug#46042)

CREATE TABLE ... SELECT could cause a server crash if no default database was selected. (Bug#45998)

The MySQL Server crashed when performing a REPLACE into a MERGE table if there was a duplicate. (Bug#45800)

An infinite hang and 100% CPU usage occurred after handler tried to open a merge table.

If the command mysqladmin shutdown was executed during the hang, the debug server generated the following assert:

mysqld: table.cc:407: void free_table_share(TABLE_SHARE*): Assertion `share->ref_count ==
0' failed.
090610 14:54:04 - mysqld got signal 6 ;

(Bug#45781)

For problems reading SSL files during SSL initialization, the server wrote error messages to stderr rather than to the error log. (Bug#45770)

The vendor name change from MySQL AB to Sun Microsystems, Inc. in RPM packages was not handled gracefully when upgrading MySQL using an RPM package. (Bug#45534)

A Windows Installation using the GUI installer would fail with:

MySQL Server 5.1 Setup Wizard ended prematurely

The wizard was interrupted before MySQL Server 5.1. could be completely installed.

Your system has not been modified. To complete installation at another time, please run
setup again.

Click Finish to exit the wizard

This was due to an step in the MSI installer that could fail to execute correctly on some environments. (Bug#45418)

Invalid memory reads could occur using the compressed client/server protocol. (Bug#45031)

The mysql_real_connect() C API function only attempted to connect to the first IP address returned for a hostname. This could be a problem if a hostname mapped to multiple IP address and the server was not bound to the first one returned. Now mysql_real_connect() attempts to connect to all IPv4 or IPv6 addresses that a domain name maps to. (Bug#45017)

See also Bug#47757.

Invalid input could cause invalid memory reads by the parser. (Bug#45010)

Some files in an AIX tar file distribution unpacked with incorrect permissions. (Bug#44647)

For debug builds, executing a stored procedure as a prepared statement could sometimes cause an assertion failure. (Bug#44521)

Using mysql_stmt_execute() to call a stored procedure could cause a server crash. (Bug#44495)

Creating a new instance after previously removing an instance would fail to complete the installation properly because the security settings could not be applied correctly. (Bug#44428)

mysqlslap ignored the --csv option if it was given without an argument. (Bug#44412)

Enabling the event scheduler from within the file specified by --init-file caused a server crash. (Bug#43587)

The server did not always check the return value of calls to the hash_init() function. (Bug#43572)

mysqladmin --count=X --sleep=Y incorrectly delayed Y seconds after the last iteration before exiting. (Bug#42639)

A test for stack growth failed on some platforms, leading to server crashes. (Bug#42213)

mysqladmin did not have enough space allocated for tracking all variables when using --vertical or --relative with extended-status. (Bug#40395)

Partitioning a log table caused a server crash. (Bug#40281)

When using quick access methods to search for rows in UPDATE and DELETE statements, there was no check whether a fatal error had already been sent to the client while evaluating the quick condition. Consequently, a false OK (following the error) was sent to the client, causing the error to be incorrectly transformed into a warning. (Bug#40113)

SHOW PROCESSLIST could access freed memory of a stored procedure run in a concurrent session. (Bug#38816)

During installation on Windows, the MySQL Instance Configuration Wizard window could be opened at a size too small to be usable. (Bug#38723)

make_binary_distribution did not always generate correct distribution names. (Bug#37808)

The server crashed when executing a prepared statement containing a duplicated MATCH() function call in the select list and ORDER BY clause; for example, SELECT MATCH(a) AGAINST('test') FROM t1 ORDER BY MATCH(a) AGAINST('test'). (Bug#37740)

The output of mysqldump --tab for views included a DROP TABLE statement without the IF EXISTS qualifier. (Bug#37377)

mysql_upgrade silently ignored the --basedir and --datadir options, which it accepts for backward compatibility. Now it prints a warning. (Bug#36558)

mysqlimport was not always compiled correctly to enable thread support, which is required for the --use-threads option. (Bug#32991)

mysqlcheck failed to fix table names when the --fix-table-names and --all-in-1 options were both specified. (Bug#31821)

If the MySQL server was killed without the PID file being removed, attempts to stop the server with mysql.server stop waited 900 seconds before giving up. (Bug#31785)

When performing an installation on Windows using the GUI installer, the installer would fail to wait long enough during installation for the MySQL service to be installed, which would cause the installation to fail and may cause security settings, such as the root password to not be applied correctly. (Bug#30525)

mysql included extra spaces at the end of some result set lines. (Bug#29622)

The mysql client inconsistently handled NUL bytes in column data in various output formats. (Bug#28203)

mysqlimport did not correctly quote and escape table identifiers and file names. (Bug#28071)

When installing the Windows service, using quotation marks around command-line configuration parameters could cause the quotation marks to be incorrectly placed around the entire command-line option, and not just the value. (Bug#27535)

If the mysql client was built with the readline library and the .inputrc file mapped Space to the magic-space function, it became impossible to enter spaces. (Bug#27439)

If InnoDB reached its limit on the number of concurrent transactions (1023), it wrote a descriptive message to the error log but returned a misleading error message to the client, or an assertion failure occurred. (Bug#18828)

See also Bug#46672.

The test suite was missing from RPM packages. (Bug#46834)

The server could crash for queries with the following elements: 1. An “impossible where” in the outermost SELECT; 2. An aggregate in the outermost SELECT; 3. A correlated subquery with a WHERE clause that includes an outer field reference as a top-level WHERE sargable predicate; (Bug#46749)

SHOW CREATE TRIGGER for a MERGE table trigger caused an assertion failure. (Bug#46614)

Incorrect index optimization could lead to incorrect results or server crashes. (Bug#46454)

A query containing a subquery in the FROM clause and PROCEDURE ANALYSE() caused a server crash. (Bug#46184)

See also Bug#48293.

CREATE TABLE ... SELECT could cause a server crash if no default database was selected. (Bug#45998)

A Windows Installation using the GUI installer would fail with:

MySQL Server 5.1 Setup Wizard ended prematurely

The wizard was interrupted before MySQL Server 5.1. could be completely installed.

Your system has not been modified. To complete installation at another time, please run
setup again.

Click Finish to exit the wizard

This was due to an step in the MSI installer that could fail to execute correctly on some environments. (Bug#45418)

For debug builds, executing a stored procedure as a prepared statement could sometimes cause an assertion failure. (Bug#44521)

Using mysql_stmt_execute() to call a stored procedure could cause a server crash. (Bug#44495)

Important Change: Replication: RESET MASTER and RESET SLAVE now reset the values shown for Last_IO_Error, Last_IO_Errno, Last_SQL_Error, and Last_SQL_Errno in the output of SHOW SLAVE STATUS. (Bug#44270)

See also Bug#34654.

Performance: With InnoDB tables, MySQL used a less-selective secondary index to avoid a filesort even if a prefix of the primary key was much more selective.

The fix for this problem might cause other queries to run more slowly. (Bug#45828)

Partitioning: Security Fix: Accessing a table having user-defined partitioning when the server SQL mode included ONLY_FULL_GROUP_BY caused the MySQL server to crash. For example, the following sequence of statements crashed the server:

DROP TABLE IF EXISTS t1;

SET SESSION sql_mode='ONLY_FULL_GROUP_BY';

CREATE TABLE t1 (id INT, KEY(id))
    PARTITION BY HASH(id) PARTITIONS 2;

(Bug#45807)

Security Fix: The strxnmov() library function could write a null byte after the end of the destination buffer. (Bug#44834)

Important Change: Replication: When using STATEMENT or MIXED binary logging format, a statement that changes both nontransactional and transactional tables must be written to the binary log whenever there are changes to nontransactional tables. This means that the statement goes into the binary log even when the changes to the transactional tables fail. In particular, in the event of a failure such statement is annotated with the error number and wrapped inside a pair of BEGIN and ROLLBACK statements.

On the slave, while applying the statement, it is expected that the same failure and the rollback prevent the transactional changes from persisting. However, statements that fail due to concurrency issues such as deadlocks and timeouts are logged in the same way, causing the slave to stop since the statements are applied sequentially by the SQL thread.

To address this issue, we ignore concurrency failures on the slave. Specifically, the following failures are now ignored: ER_LOCK_WAIT_TIMEOUT, ER_LOCK_DEADLOCK, and ER_XA_RBDEADLOCK. (Bug#44581)

Partitioning: Truncating a partitioned MyISAM table did not reset the AUTO_INCREMENT value. (Bug#35111)

Replication: The SHOW SLAVE STATUS connection thread competed with the slave SQL thread for use of the error message buffer. As a result, the connection thread sometimes received incomplete messages. This issue was uncovered with valgrind when message strings were passed without NULL terminators, causing the error Conditional jump or move depends on uninitialised value(s). (Bug#45511)

See also Bug#43076.

Replication: For replication of a stored procedure that uses the gbk character set, the result on the master and slave differed. (Bug#45485)

Replication: The internal function purge_relay_logs() did not propagate an error occurring in another internal function count_relay_log_space(). (Bug#44115)

Replication: Large transactions and statements could corrupt the binary log if the size of the cache (as set by max_binlog_cache_size) was not large enough to store the changes.

Now, for transactions that do not fit into the cache, the statement is not logged, and the statement generates an error instead.

For nontransactional changes that do not fit into the cache, the statement is also not logged—an incident event is logged after committing or rolling back any pending transaction, and the statement then raises an error.

(Bug#43929)

See also Bug#37148.

Replication: The --database option for mysqlbinlog was ignored when using the row-based logging format. (Bug#42941)

Replication: Statements using LIMIT generated spurious Statement is not safe to log in statement format warnings in the error log, causing the log to grow rapidly in size. (Bug#42851)

See also Bug#46265, Bug#42415.

This regression was introduced by Bug#34768.

Replication: Shutting down the slave while executing FLUSH LOGS, CHANGE MASTER TO, or STOP SLAVE could sometimes cause it to crash. (Bug#38240)

Replication: When reading a binary log that was in use by a master or that had not been properly closed (possibly due to a crash), the following message was printed: Warning: this binlog was not closed properly. Most probably mysqld crashed writing it. This message did not take into account the possibility that the file was merely in use by the master, which caused some users concern who were not aware that this could happen.

To make this clear, the original message has been replaced with Warning: this binlog is either is use or was not closed properly. (Bug#34687)

The server crashed if evaluation of GROUP_CONCAT(... ORDER BY) required allocation of a sort buffer but allocation failed. (Bug#46080)

When creating tables using the IBMDB2I storage engine with the ibmdb2i_create_index_option option set to 1, creating an IBMDB2I table with a primary key should produce an additional index that uses EBCDIC hexadecimal sorting, but this index was not created. (Bug#45983)

The server crashed for attempts to use REPLACE or INSERT ... ON DUPLICATE KEY UPDATE with a view defined using a join. (Bug#45806)

Some collations were causing IBMDB2I to report inaccurate key range estimations to the optimizer for LIKE clauses that select substrings. This can be seen by running EXPLAIN. This problem primarily affects multi-byte and unicode character sets. (Bug#45803)

Invalid memory reads and writes were generated when altering merge and base tables. This could lead to a crash or Valgrind errors:

==28038== Invalid write of size 1
at: memset (mc_replace_strmem.c:479)
by: myrg_attach_children (myrg_open.c:433)
by: ha_myisammrg::attach_children() (ha_myisammrg.cc:546)
by: ha_myisammrg::extra(ha_extra_function) (ha_myisammrg.cc:944)
by: attach_merge_children(TABLE_LIST*) (sql_base.cc:4147)
by: open_tables(THD*, TABLE_LIST**, unsigned*, unsigned) (sql_base.cc:4709)
by: open_and_lock_tables_derived(THD*, TABLE_LIST*, bool) (sql_base.cc:4977)
by: open_n_lock_single_table (mysql_priv.h:1550)
by: mysql_alter_table(sql_table.cc:6428)
by: mysql_execute_command(THD*) (sql_parse.cc:2860)
by: mysql_parse(THD*, char const*, unsigned, char const**) (sql_parse.cc:5933)
by: dispatch_command (sql_parse.cc:1213)

(Bug#45796)

Inserting data into a table using the macce character set with the IBMDB2I storage engine would fail. (Bug#45793)

There was a race condition when changing innodb_commit_concurrency at runtime to the value DEFAULT. (Bug#45749)

See also Bug#42101.

Performing an empty XA transaction caused the server to crash for the next XA transaction. (Bug#45548)

SHOW CREATE TRIGGER requires the TRIGGER privilege but was not checking privileges. (Bug#45412)

An assertion failure could occur if InnoDB tried to unlock a record when the clustered index record was unknown. (Bug#45357)

--enable-plugin_name options (for example, --enable-innodb) did not work correctly. (Bug#45336)

See also Bug#19027.

If autocommit was enabled, InnoDB did not roll back DELETE or UPDATE statements if the statement was killed. (Bug#45309)

The optimizer mishandled “impossible range” conditions and returned empty results due to an uninitialized variable. (Bug#45266)

Use of DECIMAL constants with more than 65 digits in CREATE TABLE ... SELECT statements led to spurious errors or assertion failures. (Bug#45262)

The mysql client could misinterpret some character sequences as commands under some circumstances. (Bug#45236)

Use of CONVERT() with an empty SET value could cause an assertion failure. (Bug#45168)

InnoDB recovery could hang due to redo logging of doublewrite buffer pages. (Bug#45097)

When reading binary data, the concatenation function for geometry data collections did not rigorously check for available data, leading to invalid reads and server crashes. (Bug#44684)

If an error occurred during the creation of a table (for example, the table already existed) having an AUTO_INCREMENT column and a BEFORE trigger that used the INSERT ... SELECT construct, an internal flag was not reset properly. This led to a crash the next time the table was opened again. (Bug#44653)

configure.in contained references to literal instances of nm and libc, rather than to variables parameterized for the proper values on the current platform. (Bug#42721)

configure.in did not properly check for the pthread_setschedprio() function. (Bug#42599)

SHOW ERRORS returned an empty result set after an attempt to drop a nonexistent table. (Bug#42364)

A workaround for a Sun Studio bug was instituted. (Bug#41710)

For queries with a sufficient number of subqueries in the FROM clause of this form:

SELECT * FROM (SELECT 1) AS t1,
              (SELECT 2) AS t2,
              (SELECT 3) AS t3, ...

The query failed with a Too high level of nesting for select error, as though the query had this form:

SELECT * FROM (SELECT 1 FROM (SELECT 2 FROM (SELECT 3 FROM ...

(Bug#41156)

Some UPDATE statements that affected no rows returned a rows-affected count of one. (Bug#40565)

Valgrind warnings that occurred for SHOW TABLE STATUS with InnoDB tables were silenced. (Bug#38479)

In the mysql client, if the server connection was lost during repeated status commands, the client would fail to detect this and command output would be inconsistent. (Bug#37274)

A Valgrind error during subquery execution was corrected. (Bug#36995)

When invoked to start multiple server instances, mysqld_multi sometimes would fail to start them all due to not changing location into the base directory for each instance. (Bug#36654)

Rows written to the slow query log could have an indeterminate Rows_examined value due to improper initialization. (Bug#34002)

Renaming a column that appeared in a foreign key definition did not update the foreign key definition with the new column name. (Bug#21704)

Important Change: Replication: Previously, incident log events were represented as comments in the output from mysqlbinlog, making them effectively silent when playing back the binlog.

(An incident log event represents an incident that could cause the contents of the database to change without that event being recorded in the binary log.)

This meant that, if the SQL were applied to a server, it could potentially lead to the master and the slave having different data. To make it possible to handle incident log events without breaking applications that expect the previous behavior, the nonsense statement RELOAD DATABASE is added to the SQL output for that incident log event, which causes an error.

To use this functionality currently requires hand editing of the dump file and handling of each case on an individual basis by a database administrator before applying the output to a server. (Bug#44442)

mysql_upgrade now displays a message indicating the connection parameters it uses when invoking mysqlcheck. (Bug#44638)

The time zone tables for Windows available at http://dev.mysql.com/downloads/timezones.html have been updated. (Bug#39923)

The mysqltest program now has a move_file from_file to_file command for renaming files. This should be used in test cases rather than invoking an external command that might be platform specific. (Bug#39542)

The maximum value for max_binlog_cache_size has been increased from 2³² – 1 to 2⁶⁴ – 1 (even on 32-bit platforms), which enables transactions 4GB and larger to be performed when binary logging is enabled. (Bug#10206)

Performance: The InnoDB adaptive hash latch is released (if held) for several potentially long-running operations. This improves throughput for other queries if the current query is removing a temporary table, changing a temporary table from memory to disk, using CREATE TABLE ... SELECT, or performing a MyISAM repair on a table used within a transaction. (Bug#32149)

Security Fix: The server crashed if an account with the CREATE ROUTINE privilege but not the EXECUTE privilege attempted to create a stored procedure. (Bug#44798)

Security Fix: The server crashed if an account without the proper privileges attempted to create a stored procedure. (Bug#44658)

Security Fix: Four potential format string vulnerabilities were fixed (discovered by the Veracode code analysis). (Bug#44166)

Incompatible Change: The server can load plugins under the control of startup options. For example, many storage engines can be built in pluggable form and loaded when the server starts. In the following descriptions, plugin_name stands for a plugin name such as innodb.

Previously, plugin options were handled like other boolean options (see Section 4.2.3.2, “Program Option Modifiers”). That is, any of these options enabled the plugin:

--plugin_name
--plugin_name=1
--enable-plugin_name

And these options disabled the plugin:

--plugin_name=0
--disable-plugin_name
--skip-plugin_name

However, use of a boolean option for plugin loading did not provide control over what to do if the plugin failed to start properly: Should the server exit, or start with the plugin disabled? The actual behavior has been that the server starts with the plugin disabled, which can be problematic. For example, if InnoDB fails to start, existing InnoDB tables become inaccessible, and attempts to create new InnoDB tables result in tables that use the default storage engine unless the NO_ENGINE_SUBSTITUTION SQL mode has been enabled to cause an error to occur instead.

Now, there is a change in the options used to control plugin loading, such that they have a tristate format:

The values OFF, ON, and FORCE are not case sensitive.

Suppose that CSV and InnoDB have been built as pluggable storage engines and that you want the server to load them at startup, subject to these conditions: The server is permitted to run if CSV initialization fails, but must require that InnoDB initialization succeed. To accomplish that, use these lines in an option file:

[mysqld]
csv=ON
innodb=FORCE

This change is incompatible with the previous implementation if you used options of the form --plugin_name=0 or --plugin_name=1, which should be changed to --plugin_name=OFF or --plugin_name=ON, respectively.

--enable-plugin_name is still supported and is the same as --plugin_name=ON. --disable-plugin_name and --skip-plugin_name are still supported and are the same as --plugin_name=OFF. (Bug#19027)

See also Bug#45336.

Important Change: Replication: BEGIN, COMMIT, and ROLLBACK statements are no longer affected by --replicate-do-db or --replicate-ignore-db rules. (Bug#43263)

Partitioning: Queries using DISTINCT on multiple columns or GROUP BY on multiple columns did not return correct results with partitioned tables. (Bug#44821)

See also Bug#41136.

Replication: When using row-based logging, the length of an event for which the field metadata exceeded 255 bytes in size was incorrectly calculated. This could lead to corruption of the binary log, or cause the server to hang. (Bug#42749)

See also Bug#44548, Bug#44672, Bug#44752.

Replication: The warning Statement is not safe to log in statement format, issued in situations when it cannot be determined that a statement or other database event can be written reliably to the binary log using the statement-based format, has been changed to Statement may not be safe to log in statement format. (Bug#42415)

Replication: The Query_log_event used by replication to transfer a query to the slave has been refactored. Query_log_event also stores and sends the error code resulting from the execution since it, in some cases, is necessary to execute the statement on the slave as well, which should result in the same error code. The Query_log_event constructor previously worked out for itself the error code using a complex routine, the result of which was often set aside within the constructor itself. This was also involved with at least 2 known bugs relating to invalid errors, and taken as a clear sign that the constructor was not well-designed and needed to be re-written. (Bug#41948)

See also Bug#37145.

Replication: When stopping and restarting the slave while it was replicating temporary tables, the slave server could crash or raise an assertion failure. This was due to the fact that, although temporary tables were saved between slave thread restarts, the reference to the thread being used (table->in_use) was not being properly updated when restarting, continuing to reference the old thread instead of the new one. This issue affected statement-based replication only. (Bug#41725)

A separator was added between the time tag and the thread ID in the general query log file. (Bug#45387)

The combination of MIN() or MAX() in the select list with WHERE and GROUP BY clauses could lead to incorrect results. (Bug#45386)

Linker failures with libmysqld on VC++ 2008 were fixed. (Bug#45326)

Compiler warnings on Mac OS X were fixed. (Bug#45286)

Running a SELECT query over an IBMDB2I table using the cp1250 character set would produce an error

ibmdb2i error 2027: Error converting single-byte sort sequence to UCS-2 

(Bug#45197)

Use of ROUND() on a LONGTEXT or LONGBLOB column of a derived table could cause a server crash. (Bug#45152)

DROP USER could fail to drop all privileges for an account if the PAD_CHAR_TO_FULL_LENGTH SQL mode was enabled. (Bug#45100)

GROUP BY on a constant (single-row) InnoDB table joined to other tables caused a server crash. (Bug#44886)

ALTER TABLE on a view crashed the server. (Bug#44860)

When using partitioning with the IBMDB2I storage engine, the engine could report that a valid character set was not supported. (Bug#44856)

Running queries on tables with the IBMDB2I storage engine using the utf8 character would fail when using the 64-bit version of MySQL. (Bug#44811)

Index Merge followed by a filesort could result in a server crash if sort_buffer_size was not large enough for all sort keys. (Bug#44810)

See also Bug#40974.

UNCOMPRESSED_LENGTH() returned a garbage result when passed a string shorter than 5 bytes. Now UNCOMPRESSED_LENGTH() returns NULL and generates a warning. (Bug#44796)

Several Valgrind warnings were silenced. (Bug#44774, Bug#44792)

Selecting RAND(N) function where N is a column of a constant table (table with a single row) failed with a SIGFPE signal. (Bug#44768)

The PASSWORD() and OLD_PASSWORD() functions could read memory outside of an internal buffer when used with BLOB arguments. (Bug#44767)

Conversion of a string to a different character set could use the same buffer for input and output, leading to incorrect results or warnings. (Bug#44743, Bug#44766)

mysqld_safe could fail to find the logger program. (Bug#44736)

Code that optimized a read-only XA transaction failed to reset the XID once the transaction was no longer active. (Bug#44672)

A Valgrind warning related to transaction processing was silenced. (Bug#44664)

Some Perl scripts in AIX packages contained an incorrect path to the perl executable. (Bug#44643)

When creating tables using the IBMDB2I storage engine, the RCDFMT (record format) that would be applied to the corresponding files within the IBM i would be set according to the table name. During whole table operations, the name could get modified to a value inconsistent with the table name. In addition, the record format would be inconsistent compared to the file content. The IBMDB2I storage engine now adds an explicit RCDFMT clause to the CREATE TABLE statement passed down to the DB2 storage engine layer. (Bug#44610)

innochecksum could incorrectly determine the input file name from the arguments. (Bug#44484)

Incorrect time was reported at the end of mysqldump output. (Bug#44424)

Caching of GROUP BY expressions could lead to mismatches between compile-time and runtime calculations and cause a server crash. (Bug#44399)

Lettercase conversion in multibyte cp932 or sjis character sequences could produce incorrect results. (Bug#44352)

InnoDB was missing DB_ROLL_PTR information in Table Monitor COLUMNS output. (Bug#44320)

Assertion failure could occur for duplicate-key errors in INSERT INTO ... SELECT statements. (Bug#44306)

Trying to use an unsupported character set on an IBMDB2I table would produce DB2 error 2501 or 2511. The error has been updated to produce Error 2504 (Character set is unsupported). (Bug#44232)

On 64-bit Windows systems, myisamchk did not handle key_buffer_size values larger than 4GB. (Bug#43940)

For user-defined utf8 collations, attempts to store values too long for a column could cause a server crash. (Bug#43827)

Invalidation of query cache entries due to table modifications could cause threads to hang inside the query cache with state “freeing items”. (Bug#43758)

EXPLAIN EXTENDED could crash for UNION queries in which the last SELECT was not parenthesized and included an ORDER BY clause. (Bug#43612)

Multiple-table updates for InnoDB tables could produce unexpected results. (Bug#43580)

If the client lost the connection to the MySQL server after mysql_stmt_prepare(), the first call to mysql_stmt_execute() returned an error (as expected) but consecutive calls to mysql_stmt_execute() or mysql_stmt_close() crashed the client. (Bug#43560)

For DELETE statements with ORDER BY var, where var was a global system variable with a NULL value, the server could crash. (Bug#42778)

Builds linked against OpenSSL had a memory leak in association with use of X509 certificates. (Bug#42158)

There was a race condition when changing innodb_commit_concurrency at runtime from zero to nonzero or from nonzero to zero. Now this variable cannot be changed at runtime from zero to nonzero or vice versa. The value can still be changed from one nonzero value to another. (Bug#42101)

See also Bug#45749.

SELECT ... INTO @var could produce values different from SELECT ... without the INTO clause. (Bug#42009)

mysql_zap did not work on Mac OS X. (Bug#41883)

A crash occurred due to a race condition between the merge table and table_cache evictions.

00000001403C452F    mysqld.exe!memcpy()[memcpy.asm:151]
00000001402A275F    mysqld.exe!ha_myisammrg::info()[ha_myisammrg.cc:854]
00000001402A2471    mysqld.exe!ha_myisammrg::attach_children()[ha_myisammrg.cc:488]
00000001402A2788    mysqld.exe!ha_myisammrg::extra()[ha_myisammrg.cc:863]
000000014015FC5D    mysqld.exe!attach_merge_children()[sql_base.cc:4135]
000000014016A4C1    mysqld.exe!open_tables()[sql_base.cc:4697]
000000014016A898    mysqld.exe!open_and_lock_tables_derived()[sql_base.cc:4956]
000000014018BB54    mysqld.exe!mysql_insert()[sql_insert.cc:613]
000000014019EDD3    mysqld.exe!mysql_execute_command()[sql_parse.cc:3066]
00000001401A2F06    mysqld.exe!mysql_parse()[sql_parse.cc:5791]
00000001401A3C1A    mysqld.exe!dispatch_command()[sql_parse.cc:1202]
00000001401A4CD7    mysqld.exe!do_command()[sql_parse.cc:857]
0000000140246327    mysqld.exe!handle_one_connection()[sql_connect.cc:1115]
00000001402B82C5    mysqld.exe!pthread_start()[my_winthread.c:85]
00000001403CAC37    mysqld.exe!_callthreadstart()[thread.c:295]
00000001403CAD05    mysqld.exe!_threadstart()[thread.c:275]
0000000077D6B69A    kernel32.dll!BaseThreadStart()
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...

(Bug#41212)

Shared-memory connections did not work in Vista if mysqld was started from the command line. (Bug#41190)

For views created with a column list clause, column aliases were not substituted when selecting through the view using a HAVING clause. (Bug#40825)

A multiple-table DELETE involving a table self-join could cause a server crash. (Bug#39918)

Creating an InnoDB table with a comment containing a '#' character caused foreign key constraints to be omitted. (Bug#39793)

ALTER TABLE neglected to preserve ROW_FORMAT information from the original table, which could cause subsequent ALTER TABLE and OPTIMIZE TABLE statements to lose the row format for InnoDB tables. (Bug#39200)

The mysql option --ignore-spaces was nonfunctional. (Bug#39101)

If a query was such as to produce the error 1054 Unknown column '...' in 'field list', using EXPLAIN EXTENDED with the query could cause a server crash. (Bug#37362)

In the mysql client, using a default character set of binary caused internal commands such as DELIMITER to become case sensitive. (Bug#37268)

mysqldump --tab dumped triggers to stdout rather than to the .sql file for the corresponding table. (Bug#34861)

If the MYSQL_HISTFILE environment variable was set to /dev/null, the mysql client overwrote the /dev/null device file as a normal file. (Bug#34224)

mysqld_safe mishandled certain parameters if they contained spaces. (Bug#33685)

mysqladmin kill did not work for thread IDs larger than 32 bits. (Bug#32457)

Several client programs failed to interpret --skip-password as “send no password.” (Bug#28479)

Output from mysql --html did not encode the <, >, or & characters. (Bug#27884)

mysql_convert_table_format did not prevent conversion of tables to MEMORY or BLACKHOLE tables, which could result in data loss. (Bug#27149)

This release of MySQL has two known outstanding issues for Windows:

Performance: InnoDB uses random numbers to generate dives into indexes for calculating index cardinality. However, under certain conditions, the algorithm did not generate random numbers, so ANALYZE TABLE did not update cardinality estimates properly. A new algorithm has been introduced with better randomization properties, together with a system variable, innodb_use_legacy_cardinality_algorithm, that controls which algorithm to use. The default value of the variable is 1 (ON), to use the original algorithm for compatibility with existing applications. The variable can be set to 0 (OFF) to use the new algorithm with improved randomness. (Bug#43660)

Performance: If the character set for a column being compared was neither the default server character set nor latin1, InnoDB was slower than necessary due to excessive contention for a character set mutex.

As a workaround for earlier versions, set the default server character set to the character set other than latin1 that is most often used in indexed columns. (Bug#42649)

Important Change: Replication: The transactional behavior of STOP SLAVE has changed. Formerly, it took effect immediately, even inside a transaction; now, it waits until the current replication event group (if any) has finished executing, or until the user issues a KILL QUERY or KILL CONNECTION statement.

This was done to solve the problem encountered when replication was stopped while a nontransactional slave was replicating a transaction on the master. (It was impossible to roll back a mixed-engines transaction when one of the engines was nontransactional, which meant that the slave could not safely re-apply any transaction that had been interrupted by STOP SLAVE.) (Bug#319, Bug#38205)

See also Bug#43217.

Partitioning: When a value was equal to a PARTITION ... VALUES LESS THAN (value) value other than MAXVALUE, the corresponding partition was not pruned. (Bug#42944)

Replication: Unrelated errors occurring during the execution of RESET SLAVE could cause the slave to crash. (Bug#44179)

Replication: The --slave-skip-errors option had no effect when using row-based logging format. (Bug#39393)

Replication: The following errors were not correctly reported:

Information about these types of failures can now be found in the output of SHOW SLAVE STATUS. (Bug#38197)

Replication: Killing the thread executing a DDL statement, after it had finished its execution but before it had written the binlog event, caused the error code in the binlog event to be set (incorrectly) to ER_SERVER_SHUTDOWN or ER_QUERY_INTERRUPTED, which caused replication to fail. (Bug#37145)

See also Bug#27571, Bug#22725.

Replication: Column aliases used inside subqueries were ignored in the binary log. (Bug#35515)

Valgrind warnings for the DECODE(), ENCRYPT(), and FIND_IN_SET() functions were corrected. (Bug#44358, Bug#44365, Bug#44367)

On Windows, entries for build-vs9.bat and build-vs9_x64.bat were missing in win/Makefile.am. (Bug#44353)

Incomplete cleanup of JOIN_TAB::select during the filesort of rows for a GROUP BY clause inside a subquery caused a server crash. (Bug#44290)

Not all lock types had proper descriptive strings, resulting in garbage output from mysqladmin debug. (Bug#44164)

Use of HANDLER statements with INFORMATION_SCHEMA tables caused a server crash. Now HANDLER is prohibited with such tables. (Bug#44151)

MySQL Server permitted the creation of a merge table based on views but crashed when attempts were made to read from that table. The following example demonstrates this:

#Create a test table
CREATE TABLE tmp (id int, c char(2));                                           

#Create two VIEWs upon it
CREATE VIEW v1 AS SELECT * FROM tmp;                                            
CREATE VIEW v2 AS SELECT * FROM tmp;                                            

#Finally create a MERGE table upon the VIEWs
CREATE TABLE merge (id int, c char(2))
ENGINE=MERGE UNION(v1, v2);

#Reading from the merge table lead to a crash
SELECT * FROM merge;

The final line of the code generated the crash. (Bug#44040)

Some schema names longer than 8 characters were not supported by IBMDB2I. The engine has been updated to permit digits and underscore characters to be used in names longer than 8 characters. (Bug#44025)

In some circumstances, when a table is created with the IBMDB2I engine, the CREATE TABLE statement will return successfully but the table will not exist. (Bug#44022)

The ucs2_swedish_ci and utf8_swedish_ci collations did not work with indexes using the IBMDB2I storage engine. Support is now provided for MySQL when running on IBM i 6.1 or higher. (Bug#44020)

Invoking SHOW TABLE STATUS from within a stored procedure could cause a Packets out of order error. (Bug#43962)

myisamchk could display a negative Max keyfile length value. (Bug#43950)

On 64-bit systems, a key_buffer_size value larger than 4GB could couse MyISAM index corruption. (Bug#43932)

mysqld_multi incorrectly passed --no-defaults to mysqld_safe. (Bug#43876)

SHOW VARIABLES did not properly display the value of slave_skip_errors. (Bug#43835)

On Windows, a server crash occurred for attempts to insert a floating-point value into a CHAR column with a maximum length less than the converted floating-point value length. (Bug#43833)

Incorrect initialization of MyISAM table indexes could cause incorrect query results. (Bug#43737)

libmysqld crashed when it was reinitialized. (Bug#43706, Bug#44091)

UNION of floating-point numbers did unnecessary rounding. (Bug#43432)

ALTER DATABASE ... UPGRADE DATA DIRECTORY NAME failed when the database contained views. (Bug#43385)

Certain statements might open a table and then wait for an impending global read lock without noticing whether they hold a table being waiting for by the global read lock, causing a hang. Affected statements are SELECT ... FOR UPDATE, LOCK TABLES ... WRITE, TRUNCATE TABLE, and LOAD DATA INFILE. (Bug#43230)

Using an XML function such as ExtractValue() more than once in a single query could produce erroneous results. (Bug#43183)

See also Bug#43937.

Full-text prefix searches could hang the connection and cause 100% CPU consumption. (Bug#42907)

Incorrect elevation of warning messages to error messages for unsafe statements caused a server crash. (Bug#42640)

CHECK TABLE suggested use of REPAIR TABLE for corrupt tables for storage engines not supported by REPAIR TABLE. Now CHECK TABLE suggests that the user dump and reload the table. (Bug#42563)

Compressing a table with the myisampack utility caused the server to produce Valgrind warnings when it opened the table. (Bug#41541)

For a MyISAM table with DELAY_KEY_WRITE enabled, the index file could be corrupted without the table being marked as crashed if the server was killed. (Bug#41330)

For some queries, an equality propagation problem could cause a = b and b = a to be handled differently. (Bug#40925)

Killing an INSERT ... SELECT statement for a MyISAM table could cause table corruption if the table had indexes. (Bug#40827)

A multiple-table DELETE IGNORE statement involving a foreign key constraint caused an assertion failure. (Bug#40127)

Multiple-table UPDATE statements did not properly activate triggers. (Bug#39953)

The mysql_setpermission operation for removing database privileges removed global privileges instead. (Bug#39852)

A stored routine contain a C-style comment could not be dumped and reloaded. (Bug#39559)

In an UPDATE or DELETE through a secondary index, InnoDB did not store the cursor position. This made InnoDB crash in semi-consistent read while attempting to unlock a nonmatching record. (Bug#39320)

The functions listed in Section 11.17.4.2.3, “Creating Geometry Values Using MySQL-Specific Functions”, previously accepted WKB arguments and returned WKB values. They now accept WKB or geometry arguments and return geometry values.

The functions listed in Section 11.17.4.2.2, “Creating Geometry Values Using WKB Functions”, previously accepted WKB arguments and returned geometry values. They now accept WKB or geometry arguments and return geometry values. (Bug#38990)

On WIndows, running the server with myisam_use_mmap enabled caused MyISAM table corruption. (Bug#38848)

CHECK TABLE did not properly check whether MyISAM tables created by servers from MySQL 4.0 or older needed to be upgraded. This could cause problems upgrading to MySQL 5.1 or higher. (Bug#37631)

An UPDATE statement that updated a column using the same DES_ENCRYPT() value for each row actually updated different rows with different values. (Bug#35087)

For shared-memory connections, the read and write methods did not properly handle asynchronous close events, which could lead to the client locking up waiting for a server response. For example, a call to mysql_real_query() would block forever on the client side if the executed statement was aborted on the server side. Thanks to Armin Schöffmann for the bug report and patch. (Bug#33899)

CHECKSUM TABLE was not killable with KILL QUERY. (Bug#33146)

myisamchk and myisampack were not being linked with the library that enabled support for * filename pattern expansion. (Bug#29248)

For InnoDB tables that have their own .ibd tablespace file, a superfluous ibuf cursor restoration fails! message could be written to the error log. This warning has been suppressed. (Bug#27276)

COMMIT did not delete savepoints if there were no changes in the transaction. (Bug#26288)

Several memory allocation functions were not being checked for out-of-memory return values. (Bug#25058)

Incomplete cleanup of JOIN_TAB::select during the filesort of rows for a GROUP BY clause inside a subquery caused a server crash. (Bug#44290)

Use of HANDLER statements with INFORMATION_SCHEMA tables caused a server crash. Now HANDLER is prohibited with such tables. (Bug#44151)

On 64-bit systems, a key_buffer_size value larger than 4GB could couse MyISAM index corruption. (Bug#43932)

On Windows, a server crash occurred for attempts to insert a floating-point value into a CHAR column with a maximum length less than the converted floating-point value length. (Bug#43833)

libmysqld crashed when it was reinitialized. (Bug#43706, Bug#44091)

Certain statements might open a table and then wait for an impending global read lock without noticing whether they hold a table being waiting for by the global read lock, causing a hang. Affected statements are SELECT ... FOR UPDATE, LOCK TABLES ... WRITE, TRUNCATE TABLE, and LOAD DATA INFILE. (Bug#43230)

Using an XML function such as ExtractValue() more than once in a single query could produce erroneous results. (Bug#43183)

See also Bug#43937.

Incorrect elevation of warning messages to error messages for unsafe statements caused a server crash. (Bug#42640)

In an UPDATE or DELETE through a secondary index, InnoDB did not store the cursor position. This made InnoDB crash in semi-consistent read while attempting to unlock a nonmatching record. (Bug#39320)

The functions listed in Section 11.17.4.2.3, “Creating Geometry Values Using MySQL-Specific Functions”, previously accepted WKB arguments and returned WKB values. They now accept WKB or geometry arguments and return geometry values.

The functions listed in Section 11.17.4.2.2, “Creating Geometry Values Using WKB Functions”, previously accepted WKB arguments and returned geometry values. They now accept WKB or geometry arguments and return geometry values. (Bug#38990)

Support Ending for AIX 5.2: Per the http://www.mysql.com/about/legal/lifecycle/ regarding ending support for OS versions that have reached vendor end of life, we plan to discontinue building or supporting MySQL binaries for AIX 5.2 as of April 30, 2009. This release of MySQL 5.1 (5.1.34) is the last MySQL 5.1 release with support for AIX 5.2. For more information, see the March 24, 2009 note at MySQL Product Support EOL Announcements.

The optimizer_switch system variable is now available to control optimizations that can be switched on and off. See Section 7.4.2, “Controlling Switchable Optimizations”.

Replication: Important Note: Binary logging with --binlog-format=ROW failed when a change to be logged included more than 251 columns. This issue was not known to occur with mixed-format or statement-based logging. (Bug#42977)

See also Bug#42914.

Replication: Assigning an invalid directory for the --slave-load-tmpdir caused the replication slave to crash. (Bug#42861)

Replication: The mysql.procs_priv system table was not replicated. (Bug#42217)

Replication: An INSERT DELAYED into a TIMESTAMP column issued concurrently with an insert on the same column not using DELAYED, but applied after the other insert, was logged using the same timestamp as generated by the other (non-DELAYED) insert. (Bug#41719)

Replication: The MIXED binary logging format did not switch to row-based mode for statements containing the LOAD_FILE() function. (Bug#39701)

Replication: When the server SQL mode included IGNORE_SPACE, statement-based replication of LOAD DATA INFILE ... INTO tbl_name failed because the statement was read incorrectly from the binary log; a trailing space was omitted, causing the statement to fail with a syntax error when run on the slave. (Bug#22504)

See also Bug#43746.

An attempt by a user who did not have the SUPER privilege to kill a system thread could cause a server crash. (Bug#43748)

On Windows, incorrectly specified link dependencies in CMakeLists.txt resulted in link errors for mysql_embedded, mysqltest_embedded, and mysql_client_test_embedded. (Bug#43715)

mysql crashed if a request for the current database name returned an empty result, such as after the client has executed a preceding SET sql_select_limit=0 statement. (Bug#43254)

If the value of the version_comment system variable was too long, the mysql client displayed a truncated startup message. (Bug#43153)

Queries of the following form returned an empty result:

SELECT ... WHERE ... (col=col AND col=col) OR ... (false expression)

(Bug#42957)

The strings/CHARSET_INFO.txt file was not included in source distributions. (Bug#42937)

A dangling pointer in mysys/my_error.c could lead to client crashes. (Bug#42675)

Passing an unknown time zone specification to CONVERT_TZ() resulted in a memory leak. (Bug#42502)

The MySQL Instance Configuration Wizard would fail to start correctly on Windows Vista. (Bug#42386)

With more than two arguments, LEAST(), GREATEST(), and CASE could unnecessarily return Illegal mix of collations errors. (Bug#41627)

The mysql client could misinterpret its input if a line was longer than an internal buffer. (Bug#41486)

In the help command output displayed by mysql, the description for the \c (clear) command was misleading. (Bug#41268)

The load_defaults(), my_search_option_files() and my_print_default_files() functions in the C client library were subject to a race condition in multi-threaded operation. (Bug#40552)

If --basedir was specified, mysqld_safe did not use it when attempting to locate my_print_defaults. (Bug#39326)

When running the MySQL Instance Configuration Wizard in command-line only mode, the service name would be ignored (effectively creating all instances with the default MySQL service name), irrespective of the name specified on the command line. However, the wizard would attempt to start the service with the specified name, and would fail. (Bug#38379)

When MySQL was configured with the --with-max-indexes=128 option, mysqld crashed. (Bug#36751)

Setting the join_buffer_size variable to its minimum value produced spurious warnings. (Bug#36446)

The use of NAME_CONST() can result in a problem for CREATE TABLE ... SELECT statements when the source column expressions refer to local variables. Converting these references to NAME_CONST() expressions can result in column names that are different on the master and slave servers, or names that are too long to be legal column identifiers. A workaround is to supply aliases for columns that refer to local variables.

Now a warning is issued in such cases that indicate possible problems. (Bug#35383)

An attempt to check or repair an ARCHIVE table that had been subjected to a server crash returned a 144 internal error. The data appeared to be irrecoverable. (Bug#32880)

The Time column for SHOW PROCESSLIST output and the value of the TIME column of the INFORMATION_SCHEMA.PROCESSLIST table now can have negative values. Previously, the column was unsigned and negative values were displayed incorrectly as large positive values. Negative values can occur if a thread alters the time into the future with SET TIMESTAMP = value or the thread is executing on a slave and processing events from a master that has its clock set ahead of the slave. (Bug#22047)

Restoring a mysqldump dump file containing FEDERATED tables failed because the file contained the data for the table. Now only the table definition is dumped (because the data is located elsewhere). (Bug#21360)

Support Ending for AIX 5.2: Per the http://www.mysql.com/about/legal/lifecycle/ regarding ending support for OS versions that have reached vendor end of life, we plan to discontinue building or supporting MySQL binaries for AIX 5.2 as of April 30, 2009. The next release of MySQL 5.1 (5.1.34) will be the last MySQL 5.1 release with support for AIX 5.2. For more information, see the March 24, 2009 note at MySQL Product Support EOL Announcements.

Performance: The query cache now checks whether a SELECT statement begins with SQL_NO_CACHE to determine whether it can skip checking for the query result in the query cache. This is not supported when SQL_NO_CACHE occurs within a comment. (Bug#37416)

mysql-test-run.pl now supports an --experimental=file_name option. It enables you to specify a file that contains a list of test cases that should be displayed with the [ exp-fail ] code rather than [ fail ] if they fail. (Bug#42888)

The MD5 algorithm now uses the Xfree implementation. (Bug#42434)

Partitioning: A duplicate key error raised when inserting into a partitioned table using a different error code from that returned by such an error raised when inserting into a table that was not partitioned. (Bug#38719)

See also Bug#28842.

Partitioning: Several error messages relating to partitioned tables were incorrect or missing. (Bug#36001)

Replication: When binlog_format was set to STATEMENT, a statement unsafe for statement-based logging caused an error or warning to be issued even if sql_log_bin was set to 0. (Bug#41980)

Replication: When using MIXED replication format and temporary tables were created in statement-based mode, but a later operation in the same session caused a switch to row-based mode, the temporary tables were not dropped on the slave at the end of the session. (Bug#40013)

See also Bug#43046.

This regression was introduced by Bug#20499.

Replication: When using the MIXED replication format, UPDATE and DELETE statements that searched for rows where part of the key had nullable BIT columns failed. This occurred because operations that inserted the data were replicated as statements, but UPDATE and DELETE statements affecting the same data were replicated using row-based format.

This issue did not occur when using statement-based replication (only) or row-based replication (only). (Bug#39753)

See also Bug#39648.

Replication: The server SQL mode in effect when a stored procedure was created was not retained in the binary log. This could cause a CREATE PROCEDURE statement that succeeded on the master to fail on the slave.

This issue was first noticed when a stored procedure was created when ANSI_QUOTES was in effect on the master, but could possibly cause failed CREATE PROCEDURE statements and other problems on the slave when using other server SQL modes as well. (Bug#39526)

Replication: If --secure-file-priv was set on the slave, it was unable to execute LOAD DATA INFILE statements sent from the master when using mixed-format or statement-based replication.

As a result of this fix, this security restriction is now ignored on the slave in such cases; instead the slave checks whether the files were created and should be read by the slave in its --slave-load-tmpdir. (Bug#38174)

Replication: Server IDs greater than 2147483647 (2³² – 1) were represented by negative numbers in the binary log. (Bug#37313)

Replication: When its disk becomes full, a replication slave may wait while writing the binary log, relay log or MyISAM tables, continuing after space has been made available. The error message provided in such cases was not clear about the frequency with which checking for free space is done (once every 60 seconds), and how long the server waits after space has been freed before continuing (also 60 seconds); this caused users to think that the server had hung.

These issues have been addressed by making the error message clearer, and dividing it into two separate messages:

(Bug#22082)

Replication: The statements DROP PROCEDURE IF EXISTS and DROP FUNCTION IF EXISTS were not written to the binary log if the procedure or function to be dropped did not exist. (Bug#13684)

See also Bug#25705.

The IBM DB2i storage engine has been added to this release for the IBM i Series platform. For more information, see Section 13.7, “The IBMDB2I Storage Engine”. (Bug#44217)

On 64-bit debug builds, code in safemalloc resulted in errors due to use of a 32-bit value for 64-bit allocations. (Bug#43885)

make distcheck failed to properly handle subdirectories of storage/ndb. (Bug#43614)

Use of USE INDEX hints could cause EXPLAIN EXTENDED to crash. (Bug#43354)

For InnoDB tables, overflow in an AUTO_INCREMENT column could cause a server crash. (Bug#43203)