Weekly update in TiDB

Last week, we landed 49 PRs in the TiDB repositories.

Added

• Add builtin function truncate, makedate, utc_time

• Add pre-commit hook.

• Add a plan for Analyze.

• Add a check list about the things that contributors should think about before sending a PR.

• Support ENGINE option with partition option in table definition.

• Add code review guide.

Fixed

• Fix bug in converting string to hex/bit.

• Fix a few panic when infering type for some functions without argument.

• Fix a data race in Join operator.

Improved

• Add countReliable attribute in physicalPlanInfo: In CBO phrase, when row count is estimated by real statistics or limit clause, the cost is reliable.

• Refactor TypeInferer: Add a few interfaces for evaluate expression, Refine EvalBool,

• Refactor planner: Union, Hash Aggregate, Union Scan, Join, Apply, Refine code

• Refactor executor: Table Scan

• Improve contribute guide.

• Make goword happy in the following package: ddl, util, tablecodec, expression, bootstrap, model, table, ast, perfschema

• Add a few empty memory tables in information_schema: Make DTS happy.

• When where expresion can be converted to false, use dual table instead of a read table.

New Contributors

Thank you guys!

• lkk2003rty

• Ce Gao

• Zejun Li

Weekly update in TiKV

Last week, We landed 16 PRs in the TiKV repositories.

Added

• Let the right split region derive the parent region information.

• Add a hot region scheduler.

• Introduce structure log and support JSON format.

• Use --data-dir instead of --store for TiKV storage path.

Fixed

• Support idempotent bootstrap for TiKV.

• Detect snapshot in all nodes.

• Use non-system port to avoid test failed.

Improved

• Throttle big query to reduce the influence on the point query.

• Add test for applying entries.

• Use a better mechanism when re-connecting PD.

• Ignore unnecessary message size computing.