2018-01-08-tidb-weekly.md

title	date	summary	tags
Weekly update (January 01 ~ January 07, 2018)	2018-01-08	Last week, we landed 37 PRs in the TiDB repositories, 4 PRs in the TiSpark repositories, and 10 PRs in the TiKV and PD repositories.	TiDB TiKV PD TiSpark

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• Fix a bug when estimating row count for outdated histograms.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