pingcap/tidb v3.0.17 on GitHub

Improvements

Ease the impact of statistics feedback on the cluster #18770
Limit batch split count for one request #18694
Accelerate /tiflash/replica HTTP API when there are many history DDL jobs in the TiDB cluster #18386
Improve row count estimation for index equal condition #17609
Speed up the execution of kill tidb conn_id #18506

Return the actual error message instead of an empty set when a query which contains IndexHashJoin or IndexMergeJoin encounters a panic #18498
Fix the unknown column error for SQL statements like SELECT a FROM t HAVING t.a #18432
Forbid adding a primary key for a table when the table has no primary key or when the table already has an integer primary key #18342
Return an empty set when executing EXPLAIN FORMAT="dot" FOR CONNECTION #17157
Fix STR_TO_DATE's handling for format token '%r', '%h' #18725