Bug#32115 (Bad use of Name_resolution_context from current LEX in partitioning): Fixed in 5.5.3

Bug#47756 (Setting 2byte collation ID with 'set names' crashes the server): Fixed in 5.5.1

Bug#48048 (Deprecated constructs need removal in Betony): Fixed in 5.5.3

Bug#48297 (Schema name is ignored when LOAD DATA is written into binlog, replication aborts): Fixed in 5.5.0

Bug#48665 (sql-bench's insert test fails due to wrong result): Fixed in 5.5.1

Bug#48737 (Partitions: search fails with ucs2): Fixed in 5.5.1

Bug#49557 ("semisync" plugin test fails on Windows): Fixed in 5.5.3

Bug#49638 (binlog_index fails in mysql-trunk-merge): Fixed in 5.5.1

Bug#49902 (SELECT returns incorrect results): Fixed in 5.5.3

Bug#50539 (GROUP BY + COUNT(DISTINCT ) on an int column shows results off by one): Fixed in 5.5.2

Bug#48294 (assertion when creating a view based on some row() construct in select query): Fixed in 5.5.3

Bug#49838 (DROP INDEX and ADD UNIQUE INDEX for same index may corrupt definition at engine): Fixed in 5.5.5

Bug#50157 (Assertion !active_tranxs_-<is_tranx_end_pos(..) in ReplSemiSyncMaster::commitTrx): Fixed in 5.5.2

Bug#50201 (Server crashes in explain_filename on an InnoDB partitioned table): Fixed in 5.5.2

Bug#50296 (Slave reconnects earlier than the prescribed slave_net_timeout value): Fixed in 5.5.3

Bug#50574 (5.5.x allows spatial indexes on non-spatial columns, causing crashes!): Fixed in 5.5.2

Bug#50591 (bit(31) causes Duplicate entry '1-NULL' for key 'group_key'): Fixed in 5.5.3

Bug#51307 (widespread corruption with partitions and insert...select): Fixed in 5.5.5

Bug#51347 (assertion with show create table + partition by columns on decimal column): Fixed in 5.5.5

Bug#50539 (GROUP BY + COUNT(DISTINCT ) on an int column shows results off by one): Fixed in 5.5.2

Bug#50542 (5.5.x doesn't check length of key prefixes: corruption and crash results): Fixed in 5.5.2

Bug#51976 (LDML collations issue (cyrillic example)): Fixed in 5.5.5