Weekly update in TiDB

Last week, we landed 26 PRs in the TiDB repositories.

Added

• Support the MySQL syntax show privileges
• Add the limit for the number of columns when adding columns
• Add the sanity check of the precision and the scale for numeric types

Fixed

• Fix the wrong results of the CONCAT_WS built-in function
• Fix a bug in right join when some predicates are pushed to the right table
• Fix the missing start timestamp for TableDual in a transaction

Improved

• Refactor the structure of the DDL package
• Remove new lines and add the user information in the query log
• Make the limitation of query memory usage configurable
• Change the factor of the descending scan according to the improvement of descending scan performance in TiKV

Weekly update in TiKV and PD

Last week, we landed 28 PRs in the TiKV and PD repositories.

Added

• Enable prevote in PD by default
• Process approximate rows in Region

Fixed

• Fix the issue of escaping the \xFF sequences to a single byte

Improved

• Shrink the pending command queue in ApplyDelegate
• Output a log when GC finds too many versions for a single key
• Upgrade protobuf and grpcio
• Support initialization empty Region in tikv-ctl
• Adjust the pending peer filter

New contributors (Thanks!)

TiDB:

• chenyang8094
• Angryrou

TiKV:

• kbacha
• maninalift