14.13.2 CSV Limitations

The CSV storage engine does not support indexing.

Partitioning is not supported for tables using the CSV storage engine. Beginning with MySQL 5.1.12, it is no longer possible to create partitioned CSV tables. (See Bug #19307)

Beginning with MySQL 5.1.23, all tables that you create using the CSV storage engine must have the NOT NULL attribute on all columns. However, for backward compatibility, you can continue to use tables with nullable columns that were created in previous MySQL releases. (Bug #32050)