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