2018-01-02-tidb-weekly.md

title	date	summary	tags
Weekly update (December 25 ~ December 31, 2017)	2018-01-02	Last week, we landed 36 PRs in the TiDB repositories, 12 PRs in the TiSpark repositories, and 18 PRs in the TiKV and PD repositories.	TiDB TiKV PD TiSpark

Weekly update in TiDB

Last week, we landed 36 PRs in the TiDB repositories.

Added

• Add the Iterator interface in Chunk.

Removed

• Remove the useless aggregation function during buildQuantifierPlan.

Fixed

• Flen and Decimal of TypeNewDecimal should not be -1.
• To pass sysbench Prepare tests, set Fields for SelectStmt in PrepareExec.
• Fix the case that fails to split a table.
• Correct the type inference of the sum and avg functions.
• Make set transaction read only work, compatible with JDBC connector.

Improved

• Change BuildRange to build column/index/table range to improve performance.
• Make KvEncoder support encoding Prepare SQL.
• Refine codes about maxOneRow.
• Use chunk.Iterator for joinGenerator.
• Merge ranger.IndexRange and ranger.ColumnRange to ranger.NewRange.
• Reduce allocation for DetachCondsForSelectivity, and add a Filter function.
• Support alter table auto_increment.
• Support pushing down stream aggregation on mocktikv.
• Support Chunk in executors:
  • NestedLoopApply
  • UnionScanExec

Weekly update in TiSpark

Last week, we landed 12 PRs in the TiSpark repositories.

Improved

• Dynamically downgrade the index scan plan to table scan plan.
• Optimize the column logic of Aggregation pushing down.
• Add the date type pushing down logic.
• Reduce dependencies.
• Add tests for issues.
• Add switching to ignore the unsupported type.
• Use the parent child POM mode instead of submodule.

Fixed

• Fix the NPE issue of Aggregation pushing down.
• Remove time test cases.
• Modify integration scripts and .gitignore files.
• Remove the Scala lang provided in the POM file.
• Delete the unnecessary variable.

Weekly update in TiKV and PD

Last week, we landed 18 PRs in the TiKV and PD repositories.

Added

• Support builtin aggregation functions bit_and, 'bit_or and bit_xor in Coprocessor.
• Upgrade the version of gRPC-rs to 0.2.
• Make delete_range configurable.
• Enable table split by default.
• Add trend API in PD.
• Increase the priority of the raftstore thread.
• Add ScatterRegion API in PD.
• Move SST instead of copying in injestion.
• Update the version of fail-rs to 0.2.

Fixed

• Fix the return type of avg and sum in Coprocessor.
• Catch stale command in the scheduler.
• Fix build error on macOS.

Improved

• Clean up the select interface in Coprocessor.
• Collect metrics more efficiently in Coprocessor.
• Make fail point tests more stable.

New contributor (Thanks!)

• TiKV: Rain Li