Weekly update in TiDB

Last week, we landed 39 PRs in the TiDB repositories.

Added

• Support Revoke statement.

• Add rules in parser and empty implementation for unsupported builtin functions: #2667, #2677, #2679

• Support wildcard chars in username or host in Grant statement.

• Add a context arggument for distsql/kv interface: We will use the context to cancel running jobs.

• Support Create Table ... Like statement.

• Support ON UPDATE CURRENT_TIMESTAMP with precision

• Support Show Warnings statement.

Fixed

• Fix memory leak when IndexScanExecutor meet error.

• Add missing field length information for show databases;

• Add missing field length information for Show statement.

• Fix compatibility problme about string truncate error.

• Ignore malformated data in MySQL packet.

• Fix a bug about topn operator pushdown.

• Fix a bug about add column with default value and not null flag.

Improved

• Prune correlated columns in groupby item list.

• Imporve the performance of point get query using primary key or unique key by 3%.

• Decorrelated for aggregation.

Weekly update in TiKV

Last week, We landed 25 PRs in the TiKV repositories.

Added

• Detect system CPU/memory to adjust config automatically.

• Add RocksDB statistics.

• Balance store according to region count.

• Add label, ping , admin, scheduler, operator commands for pd-ctl.

• Add shuffle region scheduler.

Fixed

• Verify PD address when start pd-ctl.

• Reject read index when new leader hasn’t committed the empty entry.

• Accelerate campaign faster after split happens.

• Use default value in column info.

Improved

• Save one TS get for single point get by unique or primary key.

• Prettfiy command label name in metrics.

• Make Raft apply atomically.

• Add region ID for scheduler slow log.