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2.2.6 Bug Fixes • TiDB – Fix an error that occurs during execution caused by the wrong execution plan. The wrong execution plan is caused by the shallow copy of schema columns when pushing down the #28254 – Fix the wrong partition pruning when the partition function is out of range #28233 – Fix the issue that planner might cache invalid plans for join in some cases #28087 – Fix wrong IndexLookUpJoin fails to perform checksum on a target cluster #27686 – Fix wrong results of the date_add and date_sub functions in some cases #27232 – Fix wrong results of the hour function in vectorized expression #28643

Limit/TopN, which resolves the issue that Limit/TopN cannot be pushed down in some situations due to wrong estimation. User document, #26085 • Improve index selection of the optimizer Add pruning rules Fix the wrong value returned when querying a partitioned table using Limit #24636 – Fix the issue that IFNULL does not correctly take effect on the ENUM or SET type column #24944 – Fix the wrong results result of index join in correlated subqueries is wrong #25799 • TiKV – Fix the wrong tikv_raftstore_hibernated_peer_state metric #10330 – Fix the wrong arguments type of the json_unquote() function in

change that occurs when up- grading the cluster from v4.x to v5.x #25422 – Fix the issue of the wrong result that occurs when using different collations in a subquery #30748 – Fix the issue that the optimistic transaction mode #30410 – Fix the issue that the query execution plan of IndexMerge is wrong when an expression cannot be pushed down to TiKV #30200 – Fix the issue that concurrent column type inconsistency between the schema and the data #31048 – Fix the issue that the IndexMerge query result is wrong when there is a subquery #30913 – Fix the panic issue that occurs when the FetchSize is set too

position out of range Firebird 2.1 Error Codes in pass1_union_auto_cast -104 336397225 dsql_cte_wrong_reference Recursive CTE member (@1) can refer itself only in FROM clause -104 336397226 dsql_cte_cycle dsql_cte_nonrecurs_after_recurs CTE '@1' defined non-recursive member after recursive -104 336397231 dsql_cte_wrong_clause Recursive member of CTE '@1' has @2 clause -104 336397232 dsql_cte_union_all Recursive members array column in index @1 -689 335544403 badpagtyp Page @1 is of wrong type (expected @2, found @3) -689 335544650 page_type_err Wrong page type -690 335544679 no_segments_err Segments not allowed in

issue that the execution result of project elimination might be wrong when the projection result is empty #23887 – Fix the issue of wrong query results when a column contains NULL values in some cases cases #23891 – Forbid generating MPP plans when the scan contains virtual columns #23886 – Fix the wrong reuse of PointGet and TableDual in Plan Cache #23187 #23144 #23304 #23290 – Fix the error that occurs literal constant is incorrectly built #23672 – Fix the potential wrong results of the IN clause in some cases #23889 – Fix the wrong results of some string functions #23759 – Users now need both INSERT

connection and operation. In the case of many TiDB instances, this method is not easy to use and prone to wrong operations. Starting from v6.1.0, the enable-global-kill configuration is introduced and enabled by data #33070 • Fix the issue of wrong query result because the UnionScan operator cannot main- tain the order #33175 • Fix the issue that the Merge Join operator gets wrong results in certain cases #33042 #33042 83 • Fix the issue that the index join result might be wrong in the dynamic pruning mode #33231 • Fix the issue that data might not be garbage-collected when some partitions of a partitioned table

read engine #39344 @Yisaer • Fix the issue that mistakenly pushing down StreamAgg to TiFlash causes wrong results #39266 @fixdb • TiKV • Fix an error in Raft Engine ctl #11119 @tabokie • Fix the Get raft {update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: # important here! you need deal the Exception from the TiDB try: connection.commit() {update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: connection.commit() optimistic = os.environ.get('OPTIMISTIC') alice = os.environ

be used in REPLACE INTO statements #34325 @YangKeao • Fix the issue that TiDB might select the wrong partition when querying Hash partitioned tables #50044 @Defined2014 • Fix the connection error that {update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: # important here! you need deal the Exception from the TiDB try: connection.commit() {update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: connection.commit() optimistic = os.environ.get('OPTIMISTIC') alice = os.environ

{update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: # important here! you need deal the Exception from the TiDB try: connection.commit() {update_user} successful') except Exception as err: connection.rollback() print(f'something went wrong: {err}') else: connection.commit() optimistic = os.environ.get('OPTIMISTIC') alice = os.environ force the TiDB optimizer to use this index. This can prevent the TiDB optimizer from selecting the wrong index due to inaccurate statistics or other problems. In the following query, assuming that indexes