Weekly update in TiDB

Last week, we landed 28 PRs in the TiDB repositories.

Added

• Support AdminCleanupIndex to clean up the dangling index
• Support AlterTableComment
• Add RawDeleteRange API
• Make session transaction isolation level take effect only once

Fixed

• Fix row estimation for the pseudo unique key
• Fix row count estimation for the column with null values
• Fix the result of cast (0x10 as binary(2))
• Fix zero value issue for binary type
• Merge BatchGet results to fix InsertIgnore in a transaction block

Improved

• Track memory usage for NestedLoopApply
• Delete ranges when rolling back add index
• Optimize the insert executor on duplicate key update
• Upgrade mysql.db user column length to 32

Weekly update in TiSpark

Last week, we landed 1 PR in the TiSpark repositories.

Added

• Fix single read for count(1) case

Weekly update in TiKV and PD

Last week, we landed 9 PRs in the TiKV and PD repositories.

Added

• Support compact_region by tikv-ctl
• Add ImportKVService
• Add raw batch put/get/delete/scan

Fixed

• Fix OOM when receiving too many snapshots

Improved

• Update MVCC debug structure

New contributors (Thanks!)

TiKV:

• Xiaoguang Sun
• Matt Friedman

Docs:

• Valerian Pereira