Weekly update in TiDB

Last week, we landed 33 PRs in the TiDB repositories.

Added

• Add system table mysql.stats_meta: used for storing statistic information.

• Add a Restful API to get region info from pd.

• Add a system variable to control the behavior of unfolding subquery in in expression.

• Add many builtin functions: acos, asin, atan, make_set, oct, pi, lpad, radians, exp, ip_v6

Fixed

• Check truncated UTF8 string when casting value.

• Fix data race.

• Stop the service when meet critical error.

• Keep the return value of builtin function conv consistent with MySQL when meet invalid input.

Improved

• Refactor tikv coprocessor client: make code cleaner and fix memory leak.

• Refactor code about aggregation pushdown and aggregation prunning: make code cleaner.

New Contributors

Thank you guys!

• Huxley Hu

• Zhao Yi Jun

• silenceper

• Rick Yu

• Qiannan

• Tao Meng

• yangwenmai

• Hongyuan Wang

• 8cbx

• alston111111

• Du Chuan

Weekly update in TiKV

Last week, We landed 10 PRs in the TiKV repositories.

Added

• Use SSE support by default.

• Handle [CTRL + D] in pd-ctl (https://github.com/pingcap/pd/pull/570)

Fixed

• Avoid panic when get the tombstone store information.

• Check epoch in ReadIndex to avoid stale read.

• Clean ReadIndex callback when peer is destroyed to avoid deadlock.

Improved

• Queue vote to prevent followers from discarding it if region hasn’t been split.

• Improve random picking region from cache.