Weekly update in TiDB

Last week, we landed 37 PRs in the TiDB repositories.

Added

• Support the PACK_KEYS option in the CreateTable statement.
• Show job's start time in the result of admin show ddl ....

Fixed

• Fix a bug when initializing HTTP stats handler.
• Fix a bug when estimating row count for outdated histograms.
• Consider time zone for builtin functions curtime/sysdate/curdate.

Improved

• Refactor Chunk.AppendRow to handle virtual.
• Refactor hybrid type expressions.
• Only do a shallow copy when evaluating a “Column” expression.
• Refine the design of schema.
• Use more compact structure for histograms.
• Convert the aggregation operator max/min to topN.
• Shard the implicit row ID to avoid hot spot.
• Support Chunk for StreamAggExec.
• Support Chunk for HashAggExec.

Weekly update in TiSpark

Last week, we landed 4 PRs in the TiSpark repositories.

Improved

• Add potential missing test cases.
• Simplify Aggregation pushdown.

Fixed

• Fix the dependency for jackson and joda-time.
• Fix the error handling logic.

Weekly update in TiKV and PD

Last week, we landed 10 PRs in the TiKV and PD repositories.

Added

• Add timer to support worker timeout later.
• tikv-ctl: add bad-regions subcommand.
• coprocessor/endpoint: initialize runtime in response.

Fixed

• tests: fix some failpoints name.
• scheduler: fix hot region scheduler select store problem.
• Fix the score when region size is zero.

Improved

• raftstore: add Lease.
• util: remove BatchRunnable and use Runnable instead.
• tests: remove redundant storage tests.
• Change github.com/Sirupsen/logrus to github.com/sirupsen/logrus.

New contributor (Thanks!)

• TiDB: Cruth kvinc