2017-07-31-tidb-weekly.md

layout	title
post	Weekly Update

Weekly update in TiDB

2017-07-31

Last week, we landed 50 PRs in the TiDB repositories.

Added

• Add a debugging tool for transaction inspection.
• Support two JSON syntactic sugars.
• Support renaming multiple tables in a single statement.

Fixed

• Fix a bug in the update statement when doing the alter table after statement.
• Fix signed integer overflow in the minus unary scalar function.
• Fix the content in the information_schema for unsigned columns.
• Fix inserting zero length data into a column with zero field length.
• Check the field length limitation in the alter table statement.
• Add the field length limitation for the index columns.
• The password builtin function should return empty string when meeting null argument.
• Check the table name with white space in the end.

Improved

• Add more DDL test cases.
• Refactor the explain statement.
• Refactor the following expression/builtin-function evaluation framework:
  • pi
  • logicalAnd
  • cot
  • exp
  • logicalXor
  • bitAnd
  • logicalOr
  • bitOr
  • bitXor
  • leftShift
  • rightShift
  • bitNeg
• Extract configuration related code to the config package.
• Improve the unit test coverage:
  • ast package
• Fix a bug of using undefined user variable.
• Make go vet happy.

New Contributor (Thanks!)

• Jiaxing Liang
• Hu Ming
• Wei Fu
• Liao Qiang

Weekly update in TiKV

Last week, We landed 27 PRs in the TiKV repositories.

Added

• Add the transaction debugging gRPC API.
• Add the ceil, abs functions for coprocessor.
• Add the compaction priority for RocksDB.
• Handle thenull datum for coprocessor.

Fixed

• Decrease the load limit to 10000.
• Fix a bug when using offset in expressions for coprocessor.
• Fix trace_size computing.
• Let Travis decide which compiler to use automatically.
• Fix a message delay bug.
• Avoid unnecessary clones when sending Raft messages.

Improved

• Log more detailed error when transaction fails.
• Refactor RocksDB options.
• Implement serde for enum and readable types.
• Use the FIFO queue for coprocessor work queue.
• Decrease default leader-schedule-limit to 64.
• Update distinct score calculation for different stores.
• Enhance the PD join function.

New contributors

• ariesdevil
• bailaohe
• dantin