TiDB 4.0.0-beta release, NewSQL distributed database

TiDB 4.0.0-beta  has been released, this version updates are as follows: 

Improvements

• Index JoinBy considering the number of rows in the table-driven table and driven to improve the accuracy of calculation cost # 12085
• When the index can completely cover the columns involved in the query, improve performance # 12022
• By supporting the index merge feature # 10121  # 10512  # 11245  # 122,248  # 12248  # 12305  # 12305  # 12305  # 12248  # 12248  # 12305  # 12305  # 12248  # 12305  # 12305  # 12248  # 12248  # 12248  # 12305
• By the results and eliminate duplicate cache index result, improve performance and reduce the range of the calculated CPU overhead # 12856
• The level and ordinary level slow log log isolated # 12359
• The query-log-max-lendefault value of the parameter is increased to 4096reduce the number of SQL truncated output. This parameter can be dynamically adjusted. # 12491
• ......

New Features

• Support in ADMIN SHOW DDL JOBSuse LIKEor  WHEREclause condition filter # 12484
• In information_schema.tablesadding table TIDB_ROW_ID_SHARDING_INFOcolumns to output RowIDthe scattered information (e.g., the table Aof SHARD_ROW_ID_BITSvalue "SHARD_BITS={bit_number}") # 13418
• Add oom-use-tmp-storageparameters (by default true) to control when performing memory usage exceeds a single SQL statement mem-quota-queryand contains SQL Hash Join, the temporary files to cache whether the intermediate results # 11832  # 11937  # 12116  # 12067
• By HTTP support  info/allbinlog status query interface to the cluster-enabled server TiDB  # 13025
• Add support column attribute AutoRandomkeywords to whether the control system is automatically assigned to the primary key a random integer, thereby avoiding the AUTO_INCREMENThot spots caused by the primary key # 13127
• Support Locks the Table # 11038
• ......

Changed Behaviors

• Error Code SQL optimization to eliminate the error message ERROR 1105 (HY000)codes ( Unknown Errortype)
  • ＃14002 ＃13874 ＃13733 ＃13654 ＃13646
  • ＃13540 ＃13366 ＃13329 ＃13300 ＃13233
  • ＃13033 ＃12866 ＃14054
• When performing INSERT/  REPLACE/  DELETE/  UPDATEused during memory than MemQuotaQuerythe specified limit entry configuration, log or cancel print SQL execution. The actual behavior depends on OOMActionthe configuration # 14179  # 14289  # 14299

Bugfix

• Repair and RBAC several issues related to # 13820  # 13940  # 14090  # 13940  # 13014
• Since the restoration SELECTstatement contains unionissues and can not create a VIEW # 12595
• Repair and CASTseveral issues related to the function
  • ＃12858 ＃11968 ＃11640 ＃11483 ＃11493
  • ＃11376 ＃ 11355 ＃11114 ＃14405 ＃143405
  • ＃13837 ＃13401 ＃13334 ＃ 12652 ＃12864
  • ＃12623 ＃11989

More details to see the release notes .