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release-2.1.16.md

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TiDB 2.1.16 Release Notes
/docs/dev/releases/release-2.1.16/
/docs/dev/releases/2.1.16/
TiDB 2.1.16 was released on August 15, 2019. It includes various fixes and improvements to the SQL optimizer, SQL execution engine, server, DDL, TiKV, TiDB Binlog, TiDB Lightning, and TiDB Ansible. Some notable changes include support for subqueries within SHOW statements, fixing issues with DATE_ADD function, and adding configuration items in Drainer for TiDB Binlog.

TiDB 2.1.16 Release Notes

Release date: August 15, 2019

TiDB version: 2.1.16

TiDB Ansible version: 2.1.16

TiDB

  • SQL Optimizer
    • Fix the issue that row count is estimated inaccurately for the equal condition on the time column #11526
    • Fix the issue that TIDB_INLJ Hint does not take effect or take effect on the specified table #11361
    • Change the implementation of NOT EXISTS in a query from OUTER JOIN to ANTI JOIN to find a more optimized execution plan #11291
    • Support subqueries within SHOW statements, allowing syntaxes such as SHOW COLUMNS FROM tbl WHERE FIELDS IN (SELECT 'a') #11461
    • Fix the issue that the SELECT … CASE WHEN … ELSE NULL ... query gets an incorrect result caused by the constant folding optimization #11441
  • SQL Execution Engine
    • Fix the issue that the DATE_ADD function gets a wrong result when INTERVAL is negative #11616
    • Fix the issue that the DATE_ADD function might get an incorrect result because it performs type conversion wrongly when it accepts an argument of the FLOAT, DOUBLE, or DECIMAL type #11628
    • Fix the issue that the error message is inaccurate when CAST(JSON AS SIGNED) overflows #11562
    • Fix the issue that other child nodes are not closed when one child node fails to be closed and returns an error during the process of closing Executor #11598
    • Support SPLIT TABLE statements that return the number of Regions that are successfully split and a finished percentage rather than an error when the scheduling is not finished for Region scatter before the timeout #11487
    • Make REGEXP BINARY function case sensitive to be compatible with MySQL #11505
    • Fix the issue that NULL is not returned correctly because the value of YEAR in the DATE_ADD/DATE_SUB result overflows when it is smaller than 0 or larger than 65535 #11477
    • Add in the slow query table a Succ field that indicates whether the execution succeeds #11412
    • Fix the MySQL incompatibility issue caused by fetching the current timestamp multiple times when a SQL statement involves calculations of the current time (such as CURRENT_TIMESTAMP or NOW) #11392
    • Fix the issue that the AUTO_INCREMENT columns do not handle the FLOAT or DOUBLE type #11389
    • Fix the issue that NULL is not returned correctly when the CONVERT_TZ function accepts an invalid argument #11357
    • Fix the issue that an error is reported by the PARTITION BY LIST statement. (Currently only the syntax is supported; when TiDB executes the statement, a regular table is created and a prompting message is provided) #11236
    • Fix the issue that Mod(%), Multiple(*), and Minus(-) operations return an inconsistent 0 result with that in MySQL when there are many decimal digits (such as select 0.000 % 0.11234500000000000000) #11353
  • Server
    • Fix the issue that the plugin gets a NULL domain when OnInit is called back #11426
    • Fix the issue that the table information in a schema can still be obtained through the HTTP interface after the schema has been deleted #11586
  • DDL
    • Disallow dropping indexes on auto-increment columns to avoid incorrect results of the auto-increment columns caused by this operation #11402
    • Fix the issue that the character set of the column is not correct when creating and modifying the table with different character sets and collations #11423
    • Fix the issue that the column schema might get wrong when alter table ... set default... and another DDL statement that modifies this column are executed in parallel #11374
    • Fix the issue that data fails to be backfilled when Generated Column A depends on Generated Column B and A is used to create an index #11538
    • Speed up ADMIN CHECK TABLE operations #11538

TiKV

  • Support returning an error message when the client accesses a TiKV Region that is being closed #4820
  • Support reverse raw_scan and raw_batch_scan interfaces #5148

Tools

  • TiDB Binlog
    • Add the ignore-txn-commit-ts configuration item in Drainer to skip executing some statements in a transaction #697
    • Add the configuration item check on startup, which stops Pump and Drainer from running and returns an error message when meeting invalid configuration items #708
    • Add the node-id configuration in Drainer to specify Drainer's node ID #706
  • TiDB Lightning
    • Fix the issue that tikv_gc_life_time fails to be changed back to its original value when 2 checksums are running at the same time #224

TiDB Ansible

  • Add the log4j configuration file in Spark #842
  • Update the tispark jar package to v2.1.2 #863
  • Fix the issue that the Prometheus configuration file is generated in the wrong format when TiDB Binlog uses Kafka or ZooKeeper #845
  • Fix the bug that PD fails to switch the Leader when executing the rolling_update.yml operation #888
  • Optimize the logic of rolling updating PD nodes - upgrade Followers first and then the Leader - to improve stability #895