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TiDB 2.1.12 Release Notes
/docs/dev/releases/release-2.1.12/
/docs/dev/releases/2.1.12/
TiDB 2.1.12 was released on June 13, 2019. It includes various bug fixes and improvements, such as fixing issues with data type mismatches, charset altering, and GRANT operations. The release also improves compatibility with MySQL and addresses issues with functions, data conversion, and error reporting. Additionally, PD and TiKV have also been updated to fix issues related to leader election and data availability during leader transfer and power failure.

TiDB 2.1.12 Release Notes

Release date: June 13, 2019

TiDB version: 2.1.12

TiDB Ansible version: 2.1.12

TiDB

  • Fix the issue caused by unmatched data types when using the index query feedback #10755
  • Fix the issue that the blob column is changed to the text column caused by charset altering in some cases #10745
  • Fix the issue that the GRANT operation in the transaction mistakenly reports "Duplicate Entry" in some cases #10739
  • Improve the compatibility with MySQL of the following features
    • The DAYNAME function #10732
    • The MONTHNAME function #10733
    • Support the 0 value for the EXTRACT function when processing MONTH #10702
    • The DECIMAL type can be converted to TIMESTAMP or DATETIME #10734
  • Change the column charset while changing the table charset #10714
  • Fix the overflow issue when converting a decimal to a float in some cases #10730
  • Fix the issue that some extremely large messages report the "grpc: received message larger than max" error caused by inconsistent maximum sizes of messages sent/received by gRPC of TiDB and TiKV #10710
  • Fix the panic issue caused by ORDER BY not filtering NULL in some cases #10488
  • Fix the issue that values returned by the UUID function might be duplicate when multiple nodes exist #10711
  • Change the value returned by CAST(-num as datetime) from error to NULL #10703
  • Fix the issue that an unsigned histogram meets signed ranges in some cases #10695
  • Fix the issue that an error is reported mistakenly for reading data when the statistics feedback meets the bigint unsigned primary key #10307
  • Fix the issue that the result of Show Create Table for partitioned tables is not correctly displayed in some cases #10690
  • Fix the issue that the calculation result of the GROUP_CONCAT aggregate function is not correct for some correlated subqueries #10670
  • Fix the issue that the result is wrongly displayed when the memory table of slow queries parses the slow query log in some cases #10776

PD

  • Fix the issue that etcd leader election is blocked in extreme conditions #1576

TiKV

  • Fix the issue that Regions are not available during the leader transfer process in extreme conditions #4799
  • Fix the issue that TiKV loses data when the power of the machine fails abnormally, caused by delayed data flush to the disk when receiving snapshots #4850