MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0
The SQL standard imposes a constraint on window functions that
they cannot be used in UPDATE or
DELETE statements to update rows.
Using such functions in a subquery of these statements (to
select rows) is permitted.
MySQL does not support these window function features:
DISTINCT syntax for aggregate window
functions.
Nested window functions.
Dynamic frame endpoints that depend on the value of the current row.
The parser recognizes these window constructs which nevertheless are not supported:
The GROUPS frame units specifier is
parsed, but produces an error. Only ROWS
and RANGE are supported.
The EXCLUDE clause for frame
specification is parsed, but produces an error.
IGNORE NULLS is parsed, but produces an
error. Only RESPECT NULLS is supported.
FROM LAST is parsed, but produces an
error. Only FROM FIRST is supported.