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TiDB 2.1.5 Release Notes
Releases
/docs/releases/2.1.5/

TiDB 2.1.5 Release Notes

On February 28, 2019, TiDB 2.1.5 is released. The corresponding TiDB-Ansible 2.1.5 is also released. Compared with TiDB 2.1.4, this release has greatly improved the stability, the SQL optimizer, statistics, and the execution engine.

TiDB

  • SQL Optimizer/Executor
    • Make SHOW CREATE TABLE do not print the column charset information when the charset information of a column is the same with that of a table, to improve the compatibility of SHOW CREATE TABLE with MySQL #9306
    • Fix the panic or the wrong result of the Sort operator in some cases by extracting ScalarFunc from Sort to a Projection operator for computing to simplify the computing logic of Sort #9319
    • Remove the sorting field with constant values in the Sort operator #9335, #9440
    • Fix the data overflow issue when inserting data into an unsigned integer column #9339
    • Set cast_as_binary to NULL when the length of the target binary exceeds max_allowed_packet #9349
    • Optimize the constant folding process of IF and IFNULL #9351
    • Optimize the index selection of TiDB using skyline pruning to improve the stability of simple queries #9356
    • Support computing the selectivity of the DNF expression #9405
    • Fix the wrong SQL query result of !=ANY() and =ALL() in some cases #9403
    • Fix the panic or the wrong result when the Join Key types of two tables on which the Merge Join operation is performed are different #9438
    • Fix the issue that the result of the RAND() function is not compatible with MySQL #9446
    • Refactor the logic of Semi Join processing NULL and the empty result set to get the correct result and improve the compatibility with MySQL #9449
  • Server
    • Add the tidb_constraint_check_in_place system variable to check the data uniqueness constraint when executing the INSERT statement #9401
    • Fix the issue that the value of the tidb_force_priority system variable is different from that set in the configuration file #9347
    • Add the current_db field in general logs to print the name of the currently used database #9346
    • Add an HTTP API of obtaining the table information with the table ID #9408
    • Fix the issue that LOAD DATA loads incorrect data in some cases #9414
    • Fix the issue that it takes a long time to build a connection between the MySQL client and TiDB in some cases #9451
  • DDL
    • Fix some issues when canceling the DROP COLUMN operation #9352
    • Fix some issues when canceling the DROP or ADD partitioned table operation #9376
    • Fix the issue that ADMIN CHECK TABLE mistakenly reports the data index inconsistency in some cases #9399
    • Fix the time zone issue of the TIMESTAMP default value #9108

PD

  • Provide the exclude_tombstone_stores option in the GetAllStores interface to remove the Tombstone store from the returned result #1444

TiKV

  • Fix the issue that Importer fails to import data in some cases #4223
  • Fix the KeyNotInRegion error in some cases #4125
  • Fix the panic issue caused by Region merge in some cases #4235
  • Add the detailed StoreNotMatch error message #3885

Tools

  • Lightning
    • Do not report an error or exit when a Tombstone store exists in the cluster #4223
  • TiDB-Binlog
    • Update the DDL binlog replication plan to guarantee the correctness of DDL event replication #9304