Weekly update in TiDB

Last week, we landed 40 PRs in the TiDB repositories.

Added

• Support TIME and TIMESTAMP binary types for the PREPARE/EXECUTE statements
• Make tidb_build_stats_concurrency a global variable
• Support USE INDEX in the DELETE FROM statement

Fixed

• Fix the compatibility problem of the UNION statement
• Fix range calculation of Index Scan when Prepared Plan Cache is enabled
• Check the AUTO_INCREMENT column for the SHARD_ROW_ID_BITS statement
• Set PB code for builtinArithmeticDivideDecimalSig

Improved

• Refine the error message about Invalid default value
• Make the error log for WriteConflict more friendly
• Add the schema version to the log
• Support warnings when using Coprocessor streaming
• Add the DDL Callback log
• Do not log handshake error
• Log slow processing and waiting Coprocessor tasks separately with different labels
• Do not bind graceful shutdown to SIGTERM

Weekly update in TiSpark

Last week, we landed 4 PRs in the TiSpark repositories.

Fixed

• Fix the DateTime parse error when DateTime is in DST gap
• Fix the count(1) function used with the limit clause

Improved

• Make the tidbMapTable method return the corresponding DataFrame
• Improve the query plan test

Weekly update in TiKV and PD

Last week, we landed 35 PRs in the TiKV and PD repositories.

Added

• Use slog via the slog_stdlog crate
• Support compression in the gRPC layer

Fixed

• Fix the issue that split might cause dirty read in extreme conditions
• Correct the default value of the read thread pool configuration
• Fix load Region failure due to too large packet size
• Fix the issue that Learner cannot be successfully elected in special conditions

Improved

• Speed up decoding datum and table
• Speed up Deleting Range
• Update the gRPC version
• Make Label scheduler take care of unhealthy Regions
• Adjust timeout time for the operator which only contains TransferLeader
• Filter disconnected stores for leader transfer