Weekly update in TiDB

Last week, we landed 59 PRs in the TiDB repository.

Added

• Make the projection executor support the vectorized expression evaluation
• Support using query blocks in the optimizer hint

Improved

• Refine the usage of the expression blacklist
• Eliminate the top level Sort in subqueries
• Support pushing down predicates for window functions
• Allow inserting default into the generated columns
• Improve the length and decimal size when a base type adds/minuses/multiplies a decimal
• Decrease the memory usage of hashTable in HashJoinExec
• Replace memdb with a more efficient memory version

Fixed

• Fix the failure to add a unique index on the partitioned table (by RANGE COLUMNS)
• Fix an over-quoted bug in the BinaryJSON.Unquote function
• Limit the number of TopN items
• Fix the start timestamp in the slow log when a transaction is retried
• Set the correct stmtCtx for the EXPLAIN statement

Weekly update in TiSpark

Last week, we landed 12 PRs in the TiSpark repository and released TiSpark 2.1.4.

Improved

• Remove useless dependencies

Weekly update in TiKV and PD

Last week, we landed 40 PRs in the TiKV and PD repositories.

Added

• Add an API to get the store ID and the cluster ID
• Add an API to clear the tombstone store

Improved

• Improve parsing of URLs without HTTP prefixes
• Improve the GC of Raft logs by a dedicated thread

Fixed

• Fix the panic during the Region Merge
• Fix the panic when starting TiKV
• Fix building a Docker image
• Fix a deadlock in the Scatter Region
• Fix the silent ReadIndex response

New contributors (Thanks!)

tidb:

• newer027

parser:

• zuoRambo
• yunnian