Weekly update in TiDB

Last week, we landed 52 PRs in the TiDB repository.

Added

• Support ShowStats for the partitioned tables
• Support := in the set syntax
• Enable range typed table partition
• Add the proposal for the column pool
• Add the log for the binary executed statement
• Add the slow log for the commit statement
• Add the proposal of maintaining histograms in the plan

Improved

• Use the Pump client to write binlogs
• Export the function init() to Init() in the planner package
• Support _tidb_rowid for table scan range
• Move the parser package to a separate repository
• Update the error rate for the partitioned tables in statistics
• Refine the built-in function truncate to support the uint argument
• Split unit tests to the corresponding files in the executor/aggfuncs package
• Add the unit test for the executor/aggfuncs package
• Use the local feedback for the partitioned tables in statistics
• Support GC for partition table statistics
• Make INFORMATION_SCHEMA the first one in show databases
• Improve the Insert and Update performance for wide tables
• Use rowDecoder to decode data and evaluate the generated column for AdminCheck

Fixed

• Disable the plan cache for queries containing SubqueryExpr
• Fix the issue of executing DDL after executing the SQL failure in a transaction
• Fix the wrong result when the index join operation is performed on union scan
• Fix a panic of the prepared statement with IndexScan when using the prepared plan cache
• Fix estimation for the out of range point queries in statistics
• Clone the schema of projection for different children in the buildProj4Union function
• Correct the schema after the execution of operations is cancelled halfway
• Fix the bug that the reassigned partition ID in truncate table does not take effect

Weekly update in TiKV and PD

Last week, we landed 31 PRs in the TiKV and PD repositories.

Added

• Support more functions in Coprocessor:

  • Trim
  • Conv

• Support producing an Alpine Linux image

Fixed

• Avoid unsafe mutation for scan_mode
• Fix data race in PD RaftCluster

Improved

• Add on_stall_conditions_changed to EventListener in TiKV
• Support adding more schedulers by pd-ctl
• Add tikv_raftstore_event_duration to metrics
• Support more server configuration parameters in the PD simulator
• Support more Region key formats in the pd-ctl detach mode
• Use the same initial cluster configuration to restart the joined member
• Support the day format in ReadableDuration

New contributors (Thanks!)

tikv:

• killme2008

tidb:

• HaraldNordgren
• parastorli
• yu34po

tidb-operator:

• liufuyang