2018-08-13-tidb-weekly.md

title	date	summary	tags
Weekly update (August 06 ~ August 12, 2018)	2018-08-13	Last week, we landed 46 PRs in the TiDB repositories and 27 PRs in the TiKV and PD repositories.	TiDB TiKV PD

Weekly update in TiDB

Last week, we landed 46 PRs in the TiDB repositories.

Added

• Support the Update operation for table partition
• Support the prefix index in admin check table

Fixed

• Fix behaviors of builtin LTrim, RTrim and Trim
• Fix group_concat(a) when a is null
• Make USE INDEX(PRIMARY) work on the integer primary key
• Fix admin check table false alarm when the index contains the pkIsHandle column
• Fix inconsistent row count estimation
• Fix a bug when applying the RenameTable diff

Improved

• Perform the batch check for the constrains when adding a unique index
• Remove Exists in plan and executor
• Disable the Read Committed isolation level
• Refactor joinResultGenerator to handle the unmatched outer records
• Adjust the way of checking all the schema versions
• Update the import path from coreos/gofail to etcd-io/gofail to fix CI

Weekly update in TiKV and PD

Last week, we landed 27 PRs in the TiKV and PD repositories.

Added

• Support more functions in Coprocessor:

  • upper/lower
  • bin
  • PI
  • interval

• Support splitting Regions by the number of keys

• Make PD support allocating timestamp after recovering from incorrect system time

Fixed

• Fix the TiKV panic when the decimal overflows
• Prevent dynamic-level-size from being turned on for existing TiKV clusters

Improved

• Output unit B in tikv-ctl

• Improve TiKV Read flow statistics accuracy

• Improve the TiKV performance:

  • PR1
  • PR2
  • PR3

• Improve the PD performance

• Improve the TiKV log output

• Add a test for time fallback in PD

• Improve the PD error code

New contributors (Thanks!)

docs-cn:

• Lunatictwo

TiKV:

• smallyard
• sweetIan