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.