2017-07-24-tidb-weekly.md

title	date	summary	tags
Weekly update (July 17 ~ July 23, 2017)	2017-07-24	Last week, we landed 60 PRs in the TiDB repositories and 19 PRs in the TiKV repositories.	TiDB TiKV

Weekly update in TiDB

Last week, we landed 60 PRs in the TiDB repositories.

Added

• Add a tidb_version function to get the tidb-server version information.
• Support the READ COMMITTED isolation level.
• Support the ENCLOSED BY clause in the Load Data statement.
• Support creating index using type and comment.

Fixed

• Fix a bug when in json_unquote.
• Fix field name with comment.

• Fix the wrong offset when using the Primary Key column as the handle.

Improved

• Refactor the optimizer:
  • Refactoring projection elimination.
• Refactor the builtin function evaluation framework:
  • substring_index
  • log
  • asin
  • atan
  • acos
  • floor
  • hex
  • ceil
  • unhex
• Improve the unit test coverage:
  • table package
  • schema.go
  • kv package
  • builtin_compare.go
  • datum.go
  • distsql package
  • column.go
  • expression.go
  • scalar_function.go
• Fix a bug of using undefined user variable.

Weekly update in TiKV

Last week, We landed 19 PRs in the TiKV repositories.

Added

• Add DAG executor for coprocessor.
• Add json_object and json_array for coprocessor.
• Add the abs function for the coprocessor.
• Add the u64 support for JSON type.
• Add the max_compaction_bytes support for RocksDB.
• Add the TSO warning metrics for PD.

Fixed

• Enlarge gRPC send message length.
• Remove the unix socket from PD test.
• Fix a bug when shrinking buffer.

Improved

• Use collected properties to optimize GC.
• Get RocksDB snapshot lazily.
• Introduce rate limit to make QPS more stable.
• Send the apply proposals in batches.
• Stop supporting the old V1 snapshot format any more and support using V2 only.