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TiDB 3.0.15 Release Notes
/docs/dev/releases/release-3.0.15/
TiDB 3.0.15 was released on June 5, 2020. New features include support for admin recover index and admin check index statements on partitioned tables, as well as optimization of memory allocation mechanism. Bug fixes address issues such as incorrect results in PointGet and inconsistent results between TiDB and MySQL when XOR operates on a floating-point number. TiKV fixes issues related to memory defragmentation and gRPC disconnection.

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