pingcap/tidb v4.0.0

tidb-server v4.0.0

on GitHub

Bug Fixes

• Do not send batch commands to TiFLASH, to fix unpredictable timeout for TiFLASH engine. #17307
• Fix a bug signed/unsigned integer is not distinguished during the partition pruning, and also optimize performance for some cases. #17230
• Fix a bug that upgrading from 3.1.1 to 4.0 fails #17300
• Fix a partition selection bug for the update statement, partition selection should affect the whole update statement #17305
• Fix panic after sending fail with ambiguous errors #17380
• Fix panic when creating a key partition table #17242
• Fix planner incorrectly choose index merge join in some cases. #17365
• Fix the check of creating and altering table, unique prefix index must not be used on the partition table #17213
• Fix the execution duration metric of the SELECT statement. #16561
• Fix the issue that GC worker blocks on channel sending forever when an error occurs. #16915
• Fix the issue that UNIQUE constraint on boolean column results in an incorrect result in a comparison #17306
• Fix the panic when aggregation pushes down enable on the partition table. #17328
• Fix the problem TiDB accesses the down peers in some cases. #17342
• Fix the problem when isolation read engines in tidb.toml do not take effect. #17322
• Fix the wrong result order for enforced stream aggregation. #17347
• Make the aggregation function distinct consider collations. #17240
• Support insert/replace into tbl_name partition(partition_name_list) #17313
• Support is null filter condition in hash partition pruning #17310
• Support admin check index on the partition table #17392
• Support admin cleanup index on the partition table #17405
• Support admin recover index on the partition table. #17317
• Support range partition pruning for 'in' expression #17320
• When DIV() is used as partition expression, fix the behavior of insert operation under different sql_mode, handle ERROR_FOR_DIVISION_BY_ZERO correctly. #17314

Changed Behaviors

• Enable Green GC by default. #16955
• Make the error message of Transaction is too large easier to understand. #17219

New Features

• Make goroutine count in retry commit-phase can be controlled by committer-concurrency #16876
• Support show table partition regions. #17294
• Support temporary storage usage limitation for tidb-server #16211