Functionality added or changed:
* Support for the IBMDB2I storage engine has been removed. (Bug#58079)
* The pstack library was nonfunctional and has been removed, along with the
--with-pstack option for configure. The --enable-pstack option for mysqld is
deprecated and will be removed in MySQL 5.5. (Bug#57210)
Bugs fixed:
* Performance: InnoDB Storage Engine: Improved concurrency when several
ANALYZE TABLE or SHOW TABLE STATUS statements are run simultaneously for
InnoDB tables. (Bug#53046)
* 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#57799)
* Partitioning: An INSERT ... ON DUPLICATE KEY UPDATE column = 0 statement on
an AUTO_INCREMENT column caused the debug server to crash. (Bug#57890)
* Several compilation problems were fixed. (Bug#57992, Bug#57993, Bug#57994,
Bug#57995, Bug#57996, Bug#57997, Bug#58057)
* Passing a string that was not null-terminated to UpdateXML() or
ExtractValue() caused the server to fail with an assertion. (Bug#57279)
* Queries executed using the Index Merge access method and a temporary file
could return incorrect results. (Bug#56862)
* The find_files() function used by SHOW statements performed redundant and
unnecessary memory allocation. (Bug#51208)
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