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TiDB 2.0.4 Release Notes

On June 15, 2018, TiDB 2.0.4 is released. Compared with TiDB 2.0.3, this release has great improvement in system compatibility and stability.


  • Support the ALTER TABLE t DROP COLUMN a CASCADE syntax
  • Support configuring the value of tidb_snapshot to TSO
  • Refine the display of statement types in monitoring items
  • Optimize the accuracy of query cost estimation
  • Configure the backoff max delay parameter of gRPC
  • Support configuring the memory threshold of a single statement in the configuration file
  • Refactor the error of Optimizer
  • Fix the side effects of the Cast Decimal data
  • Fix the wrong result issue of the Merge Join operator in specific scenarios
  • Fix the issue of converting the Null object to String
  • Fix the issue of casting the JSON type of data to the JSON type
  • Fix the issue that the result order is not consistent with MySQL in the condition of Union + OrderBy
  • Fix the compliance rules issue when the Union statement checks the Limit/OrderBy clause
  • Fix the compatibility issue of the Union All result
  • Fix a bug in predicate pushdown
  • Fix the compatibility issue of the Union statement with the For Update clause
  • Fix the issue that the concat_ws function mistakenly truncates the result


  • Improve the behavior of the unset scheduling argument max-pending-peer-count by changing it to no limit for the maximum number of PendingPeers


  • Add the RocksDB PerfContext interface for debugging
  • Remove the import-mode parameter
  • Add the region-properties command for tikv-ctl
  • Fix the issue that reverse-seek is slow when many RocksDB tombstones exist
  • Fix the crash issue caused by do_sub
  • Make GC record the log when GC encounters many versions of data

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