Weekly update in TiDB

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

Added

• Support the CHAR_LENGTH built-in function.

• Support the CRC32 built-in function.

• Support the LEAST built-in function.

Fixed

• Fix a bug in Add Column with invalid default value.

• Fix a bug about parsing string to float.

• Fix a bug when using int and uint as join key.

• Fix a bug in MySQL Protocol layer about prepared statement.

Improved

• Improve string to date parser.

• Improve TiDB schema lease checker.

• Refactor optimizer: #2321, #2322

• Set a limitation on the quantity of the data in a single transaction.

• Improve mocked tikv: Split data in a table into multiple mocked regions. This will used in unit tests.

• Speed up creating table: In some cases, it is not necessary to wait a long time to create table.

• Use MySQL standard error code when meeting incorrect function argument count error.

• Find a better way to handle StoreNotMatch error.

• Refactor built-in function: #2343, #2344, #2362, #2367

• Clean up tidb-server codes: #2356, #2358

New contributor

• Zyguan

• AndreMouche

Weekly update in TiKV

Last week, We landed 19 PRs in the TiKV repositories.

Added

• Move raw_get to thread pool.

• Add ResourceKind for operator and don't resend duplicated AddPeer response when the peer is still pending, see #449.

• Add member command for pd-ctl.

Fixed

• Fix getting valid float.

Improved

• Update default configuration to speed up scheduler.

• Don't panic when receiving stale snapshot.

• Remove unnecessary region cache.

• Remove no used constraint feature.

• Exit with error message if clusert ID mismatches directly.

• Add replication section in configuration.