Weekly update in TiDB

Last week, we landed 60 PRs in the TiDB repository.

Added

• Add the slow log for the Commit statement
• Support cross-domain requests in the HTTP API
• Add the PreAlloc4Row and Insert functions for Chunk and List
• Implement Operand and Pattern of the cascades planner
• Add the TiDB version to DDL metrics
• Add a session variable to make Insert compatible with MySQL
• Add the json_keys built-in function
• Add an EXPLAIN test for partition pruning

Improved

• Improve the MySQL compatibility by adding the USAGE privilege for the showGrants statement
• Log more information when OtherError occurs in coprocessor
• Update the Delta information for the partitioned table in statistics
• Limit the length of sample values in statistics
• Refine ColumnPrune for LogicalUnionAll
• Eliminate if null on the non-null column when building Projection
• Support Group and GroupExpr for the cascades planner
• Eliminate projection after aggregation pruning
• Handle the DDL event for the partitioned table in statistics
• Refine Explain Analyze
• Remove the kv.BypassLatch option and enable the latch scheduler by default
• Refine the error log when the DDL job is canceled
• Improve the MySQL compatibility for the current_user() built-in function
• Propagate constants over outer join
• Support changing null to not null in the alter table statement

Fixed

• Fix an invalid DDL job which makes TiDB panic
• Fix a panic in limit N when N is too large and overflows an integer
• Fix a bug in point get
• Fix date time parsing for the YYYY-MM-DD HH format
• Maintain DeferredExpr in aggressive constant folding
• Fix a panic caused by the empty histogram in statistics
• Fix a panic caused by the empty schema of LogicalTableDual
• Fix data race when initializing the systemTZ variable
• Fix the admin check table bug of byte comparing
• Add the check in DDL when creating a table with a foreign key
• Fix the histogram boundaries overflow error in statistics
• Convert DataSource to TableDual only when the empty range is not derived from parameterized constants

Weekly update in TiSpark

Last week, we landed 2 PRs in the TiSpark repository.

Fixed

• Fix a bug in pyspark in Spark 2.3 that does not initialize a session correctly

Weekly update in TiKV and PD

Last week, we landed 16 PRs in the TiKV and PD repositories.

Added

• Support more functions in Coprocessor:

  • Exp
  • Radians

• Add the version information for tikv-ctl

• Add tikv raftstore event duration to metrics

Fixed

• Fix the cluster test of PD
• Fix the building failure on Mac OS X
• Fix WaitGroup data race

Improved

• Remove the PD source code and build binary from the docker image
• Update pd-ctl commands health and topsize
• Release TiKV v2.0.8
• Use the implicit project layout
• Export ThreadCollector to use it later
• Introduce eval_func and eval_func_with helper
• Extract panic_hook
• Use go mod to manage dependency

New contributor (Thanks!)

tidb: tianjiqx