Weekly update in TiDB

Last week, we landed 44 PRs in the TiDB repositories.

Added

• Make tidb_max_chunk_size a global variable
• Add a timeout for writing binlogs
• Support high_priority for DELETE/UPDATE/REPLACE INTO statements
• Support changing the log level online
• Support ComChangeUser
• Support JOIN hint for UPDATE/DELETE statements

Fixed

• Fix the compatibility problem of ON UPDATE CURRENT_TIMESTAMP
• Fix a bug of ON DUPLICATE KEY UPDATE
• Fix the decimal fraction of DIV
• Fix count estimation of betweenRowCount
• Fix the wrong result of CEIL(DECIMAL)
• Fix the wrong result of CEIL(INT) integer
• Fix the cost estimation of Index Scan and Table Scan
• Fix a bug of deleting an index in YEAR type
• Fix the wrong result of FLOOR
• Fix the false alarm of ADMIN CHECK TABLE
• Fix a panic of MAX/MIN
• Fix a bug in rebuildRange when the plan cache for the PREPARE statement is enabled

Improved

• Create a new backoff for each Region
• Do not log the Write error during handshake
• Refine the log level of stats
• Set the rollback log to the debug level
• Refine the comparison between the timestamp column and the string constant
• Push CEIL down to TiKV

Weekly update in TiSpark

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

Fixed

• Fix incorrect histogram totalRowCount

Improved

• Improve the tidbMapTable logic

Weekly update in TiKV and PD

Last week, we landed 20 PRs in the TiKV and PD repositories.

Added

• Encode and decode for arrow chunk

Fixed

• Implement GC on the stale learner automatically
• Allow Snapshot to remove only the temporary files created by itself
• Fix the panic issue when collecting hot-cache metrics

Improved

• Remove the Read trait from the decoding function of bytes
• Remove the Read trait from the decoding function of decimals
• Remove the Read trait from the decoding function of JSON

New contributors (Thanks!)

PD:

• goerzh
• shilicqupt