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TiDB 3.0.15 Release Notes

Release date: June 5, 2020

TiDB version: 3.0.15

New Features

  • TiDB

    • Forbid the query in partitioned tables to use the plan cache feature #16759
    • Support the admin recover index and admin check index statements on partitioned tables #17315 #17390
    • Support partition pruning of the in condition for Range partitioned tables #17318
    • Optimize the output of SHOW CREATE TABLE, and add quotation marks to the partition name #16315
    • Support the ORDER BY clause in the GROUP_CONCAT function #16988
    • Optimize the memory allocation mechanism of CMSketch statistics to reduce the impact of garbage collection (GC) on performance #17543

  • PD

    • Add a policy in which PD performs scheduling in terms of the number of Leaders #2479

Bug Fixes

  • TiDB

    • Use deep copy to copy the enum and set type data in the Hash aggregate function; fix an issue of correctness #16890
    • Fix the issue that PointGet returns incorrect results because of the wrong processing logic of integer overflow #16753
    • Fix the issue of incorrect results caused by incorrect processing logic when the CHAR() function is used in the query predicate #16557
    • Fix the issue of inconsistent results in the storage layer and calculation layer of the IsTrue and IsFalse functions #16627
    • Fix the incorrect NotNull flags in some expressions, such as case when #16993
    • Fix the issue that the optimizer cannot find a physical plan for TableDual in some scenarios #17014
    • Fix the issue that the syntax for partition selection does not take effect correctly in the Hash partitioned table #17051
    • Fix the inconsistent results between TiDB and MySQL when XOR operates on a floating-point number #16976
    • Fix the error that occurs when executing DDL statement in the prepared manner #17415
    • Fix the incorrect processing logic of computing the batch size in the ID allocator #17548
    • Fix the issue that the MAX_EXEC_TIME SQL hint does not take effect when the time exceeds the expensive threshold #17534

  • TiKV

    • Fix the issue that memory defragmentation is not effective after running for a long time #7790
    • Fix the panic issue caused by incorrectly removing snapshot files after TiKV is restarted accidentally #7925
    • Fix the gRPC disconnection caused by too large message packages #7822
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