TiDB 2.1.19 release, NewSQL distributed database

TiDB  2.1.19  has been released, this version updates are as follows:

TiDB

• SQL optimizer
  • Optimization  select max(_tidb_rowid) from t of the scene, to avoid full table scan  # 13294
  • When the query statement given to repair the wrong value after the user variables and predicate pushdown will lead to incorrect output  # 13230
  • Repair there may be competition when data update statistics, leading to the problem of inaccurate statistics  # 13690
  • Repair  UPDATE statement contains subquery and stored generated column incorrect results problem; repair  UPDATE statement contains two different database table names are the same, UPDATE execution error problem  # 13357
  • Repair  PhysicalUnionScan operator is not set correctly statistics, query plans may lead to problems of wrong  # 14134
  • Removing the  minAutoAnalyzeRatio constraints of the automatic  ANALYZE more timely  # 14013
  • When  WHERE there is a clause  UNIQUE KEY during equivalent conditions, to estimate the number of lines should not be greater than  1 # 13385
• SQL execution engine
  • Repair  ConvertJSONToInt is used  int64 as  uint64 an intermediate parse results, resulting in precision overflow problem  # 13036
  • Repair query contains  SLEEP a function (for example  select 1 from (select sleep(1)) t;)), because the row crop leads to a query  sleep(1) failure problem  # 13039
  • By implementing the  INSERT ON DUPLICATE UPDATE re-statement by  Chunk reducing memory overhead  # 12999
  • To the  slow_query table to add transaction-related information segment  # 13129 , as follows:
    • Prewrite_time
    • Commit_time
    • Get_commit_ts_time
    • Commit_backoff_time
    • Backoff_types
    • Resolve_lock_time
    • Local_latch_wait_time
    • Write_key
    • Write_size
    • Prewrite_region
    • Txn_retry
  • Repair  UPDATE conversion sub-queries and errors occur when the statement contains a subquery  UPDATE the  WHERE update failed when the conditions contained in sub-query problem  # 13120
  • Support in the implementation of the partition table  ADMIN CHECK TABLE # 13143
  • Repair  ON UPDATE CURRENT_TIMESTAMP as the property of the column and specify floating-point precision, SHOW CREATE TABLE and other statements display precision incomplete question  # 12462
  • Repair in  DROP/MODIFY/CHANGE COLUMN the absence of checks foreign key cause execution  SELECT * FROM information_schema.KEY_COLUMN_USAGE problems panic occurs when the statement  # 14162
  • Repair TiDB open  Streaming return data possible duplication  # 13255
  • "Invalid Time Format" to repair problems caused when daylight saving  # 13624
  • Repair integer data is converted to an unsigned  Real/ Decimal time type, precision possible loss problem  # 13756
  • Repair  Quote function handles  null the problem return type of error when the value  # 13681
  • Fix the date from when the string parsing, the use of  golang time.Local local time zone cause analysis results time zone is not the right questions  # 13792
  • Repair  builtinIntervalRealSig achieve, since  binSearch the method does not return error, leading to the final result may not be the right questions  # 13768
  • Repair  INSERT statement during question time string type to convert floating-point type, may be error of  # 14009
  • Repair  sum(distinct) function of the output result is not the right questions  # 13041
  • Repair due to  jsonUnquoteFunction the return type of the function length assignment incorrect value, resulting in  union progressive position data in the same  cast issue truncates data conversion  # 13645
  • Fix the problem due to the failure to set a password permission check is too strict lead  # 13805
• Server
  • Repair  KILL CONNECTION possible leak problems goroutine  # 13252
  • New HTTP API through the  info/all acquisition of all TiDB node interface binlog state function  # 13188
  • Fix problems in Windows build TiDB project failure  # 13650
  • New  server-version configuration item to modify TiDB server version control function  # 13904
  • Repair by Go1.13 version compiled binaries  plugin problem can not run properly  # 13527
• DDL
  • If you create a new table when the table contains  COLLATE the columns of the  COLLATE use table  COLLATE # 13190
  • Limit index names when adding functionality to create a table length  # 13311
  • Check the length of the table name is not a problem when the Table to repair the rename  # 13345
  • New  BIT column width checking function  # 13511
  • Optimization  change/modify column of error messages output, are easier to understand  # 13798
  • Perform repair  drop column operations and downstream Drainer not perform this  drop column operation, you may receive the downstream problems of this column without a DML  # 13974

TiKV

• Raftstore
  • Repair Region merge and Compact log application process if the system restart, when the restart is not set correctly because the  is_merging value of cause a system panic  # 5884
• Importer
  • Cancel gRPC message length limit  # 5809

PD

• Region lifting obtain a list of HTTP API performance  # 1988
• Upgrade etcd, can not fix the problem etcd PreVote elected leader of the (post-upgrade not downgrade)  # 2052

Tools

• TiDB Binlog
  • Binlogctl optimization state information output node  # 777
  • When Drainer filter configured to repair  nil when panic issue  # 802
  • Pump optimization of  Graceful exit strategy  # 825
  • Binlog write data in more detail the new Pump monitoring indicators  # 830
  • Optimization Drainer after executing DDL refresh logic structure information table  # 836
  • Pump fix the problem without receiving DDL commit binlog of the binlog overlooked  # 855

TiDB Ansible

• TiDB service  Uncommon Error OPM monitored item renamed  Write Binlog Error and increase the corresponding alarm  # 1038
• TiSpark upgrade to version 2.1.8  # 1063

Release Notes