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TiDB 3.0.20 Release Notes
TiDB 3.0.20 was released on December 25, 2020. The release includes compatibility changes, improvements, and bug fixes for TiDB, TiKV, and PD. Some notable bug fixes include addressing issues with incorrect cache of transaction status, inaccurate statistics, and stack overflow.

TiDB 3.0.20 Release Notes

Release date: December 25, 2020

TiDB version: 3.0.20

Compatibility Change

  • TiDB

    • Deprecate the enable-streaming configuration item #21054

Improvements

  • TiDB

    • Raise an error when preparing the LOAD DATA statement #21222

  • TiKV

    • Add the end_point_slow_log_threshold configuration item #9145

Bug Fixes

  • TiDB

    • Fix the incorrect cache of the transaction status for pessimistic transactions #21706
    • Fix the issue of inaccurate statistics that occurs when querying INFORMATION_SCHEMA.TIDB_HOT_REGIONS #21319
    • Fix the issue that DELETE might not delete data correctly when the database name is not in a pure lower representation #21205
    • Fix the issue of stack overflow that occurs when building the recursive view #21000
    • Fix the issue of goroutine leak in TiKV client #20863
    • Fix the wrong default zero value for the year type #20828
    • Fix the issue of goroutine leak in index lookup join #20791
    • Fix the issue that executing INSERT SELECT FOR UPDATE returns the malformed packet in the pessimistic transaction #20681
    • Fix the unknown time zone 'posixrules' #20605
    • Fix the issue that occurs when converting the unsigned integer type to the bit type #20362
    • Fix the corrupted default value of the bit type column #20339
    • Fix the potentially incorrect results when one of the equal condition is the Enum or Set type #20296
    • Fix a wrong behavior of != any() #20061
    • Fix the issue that type conversion in BETWEEN...AND... returns invalid results #21503
    • Fix a compatibility issue with the ADDDATE function #21008
    • Set the correct default value for newly added Enum column #20999
    • Fix the result of SQL statements like SELECT DATE_ADD('2007-03-28 22:08:28',INTERVAL "-2.-2" SECOND) to be compatible with MySQL #20627
    • Fix the incorrect default value when modifying the column type #20532
    • Fix the issue that the timestamp function gets wrong result when the input argument is the float or decimal type #20469
    • Fix a potential deadlock issue in statistics #20424
    • Fix the issue that the overflown float type data is inserted #20251

  • TiKV

    • Fix the issue that an error is returned indicating that a key exists when this key is locked and deleted in a committed transaction #8931

  • PD

    • Fix the issue that too many logs are printed when starting PD and when there are too many stale Regions #3064