Weekly update in TiDB

Last week, we landed 48 PRs in the TiDB repository.

Added

• Make incremental Analyze support feedback
• Support pessimistic transactions (experimental feature)
• Support dumping history statistics
• Support SET ROLE statements

Improved

• Handle virtual columns when fetching duplicate rows in batchChecker
• Split unit tests to shorten execution time
• Make Desc and show columns statements compatible with MySQL
• Reduce duplicate DigestHash calls
• Add a variable to control the back off time and disable transaction automatic retry by default
• Add the SplitIndexRegion syntax
• Enable hash partition and range column partition by default

Fixed

• Fix wrong column calculation in ColumnPruning for LogicalUnionAll
• Fix the issue that period_add is not compatible with MySQL
• Fix the issue that the result of cast(-1 as datetime) is not compatible with MySQL
• Fix the wrong behavior of PushDownNot in some cases
• Fix the issue that addition between datetime and the real interval is not compatible with MySQL
• Fix the issue that addition between datetime and interval is not compatible with MySQL
• Fix token too long errors when parsing slow query logs
• Fix the issue of updating the self-schema version and update logs
• Fix wrong DATE/DATETIME comparison in the BETWEEN function
• Fix the panic in the regions/meta API

Weekly update in TiSpark

Last week, we landed 8 PRs in the TiSpark repository.

Fixed

• Fix the index pushdown issue
• Fix the Table not exist exception in testing

Weekly update in TiKV and PD

Last week, we landed 45 PRs in the TiKV and PD repositories.

Added

• Introduce tipb_helper
• Add the tick registry for raftstore
• Add *AnyValue functions
• Add cop_codegen to the tikv_alloc whitelist
• Add RPN comparison functions for Int, Decimal, String, Time, Duration and Json
• Support CPU profiling sections of code
• Support the exec summary for the Limit executor

Improved

• Make some small improvements for codec
• Make tiny refactor for peer_storage in raftstore
• Skip deleting range check on raft cf
• Use raw_key in Error and reduce copies
• Simplify some code using field type conversion
• Make hot Region balance not affected by balance-region-scheduler-limit

Fixed

• Fix the issue that metrics might be counted multiple times
• Fix tick_after_destroy in testing
• Fix the issue that the first safe_point sent to PD does not trigger GC

New contributor (Thanks!)

tikv: H-ZeX