2017-12-25-tidb-weekly.md

title	Weekly update (December 18 ~ December 24, 2017)
date	2017-12-25
summary	Last week, we landed 48 PRs in the TiDB repositories, 10 PRs in the TiSpark repositories, and 13 PRs in the TiKV and PD repositories.
tags	TiDB TiKV PD TiSpark

Weekly update in TiDB

Last week, we landed 48 PRs in the TiDB repositories.

Added

• Support the builtin aggregation function bit_or.

Removed

• Remove the old JSON type.
• Remove the HashSemiJoin plan and executor.

Fixed

• Support showing the current auto_increment id in the result of show create table.
• Fix a bug of NewIndexLookUpJoin's Next().
• Fix the trigger condition for AutoAnalyze.
• Only rebuild the range when using prepared cache.

Improved

• Merge ApplyExec and NestedLoopJoin into NestedLoopApply.
• Refine the UnionAll plan building.
• Metrics: record details of the RPC type and store id.
• Replace JSON with BinaryJSON.
• Collect and store the query feedback.
• Make the function ExtractColumns more efficient.
• Add BinaryJSON functions.
• Enhance the index join, making it can be used for more scenarios.
• Graceful shutdown will wait clients to close.
• Support Chunk in executors:
  • LoadData
  • GrantExec
  • RevokeExec
  • DeallocateExec
  • SimpleExec
  • AnalyzeExec
  • TableScanExec
  • ShowDDLjobsExec
  • TableDualExec
  • ReplaceExec
  • DeleteExec
  • MergeJoinExec

Weekly update in TiSpark

Last week, we landed 10 PRs in the TiSpark repositories.

Added

• Add counting single column tests.
• Add request.timezone.offset config.
• Add the test framework for each issue.
• Add index related integration tests.
• Add debug utils.
• Add null data for DAG test cases.

Removed

• Remove timezone in the TisparkTest.sql file.

Fixed

• Fix the Load tests problem.
• Fix the test framework concerning null tests.

Weekly update in TiKV and PD

Last week, we landed 13 PRs in the TiKV and PD repositories.

Added

• Support Raft Learner.
• Add transaction tests with fail-rs.
• Add more configurations for the RocksDB column family.
• Add more complex configurations for the PD simulator.
• Coprocessor: collect output counts for each executor.

Fixed

• PD: support join without scheme.
• Return the stale epoch error for retry.
• Add the require option to the addr command flag.
• Update rustc_serialize to pass newer Rust version compilation.

Improved

• Coprocessor: speed up the CM sketch test.
• Add key_only to avoid fetching the data value.
• Avoid calling Raft status to reduce allocation.

New contributors (Thanks!)

TiKV:

• Jiahao Huang
• Andrew Hobden