Weekly update in TiDB

Last week, we landed 33 PRs in the TiDB repositories.

Added

• Add builtin function is_ipv4_mapped, makedate, utc_time

• Enable privilege checking by default. You could also disable privilege checking through --privilege=false.

• Support Analyze Index statement: after adding an index, we could run this statement to analyze the newly added index.

• Add Trigger_priv column in mysql.user system table.

• Add coveralls in CI.

Fixed

• Fix incompatible issue in found_rows().

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

• Fix a data race in Join operator.

• Fix parse time_zone -6:00.

• Fix a bug in checking duplicate column.

• Check ignored errors.

• Fix comment warning in executor package.

• Fix a bug about converting string to bit.

• Recognize uuid() as a dynamic function.

• Fix a bug in rand() with seed.

Improved

• Enlarge the stack size to save the runtime.morestack cost.

• Parallelly prewrite primary and secondary lock.

• New planner framework: SortMergeJoin, IndexReader

• Refactor expression evaluation framework: Rewrite compare operator. Implement the new Eval interface for ColumnExpr and ConstExpr. Decide the return type of ColumnExpr and ConstExpr during planning.

Weekly update in TiKV

Last week, We landed 13 PRs in the TiKV repositories.

Added

• Apply the Raft logs of multiply regions in batches.

• Add hotspot command in pd-ctl: detect and show hotspot regions.

• Add sub-compaction, base-background-compactions and writable-file-max-buffer-size for RocksDB.

• Let manual compaction run concurrently with background compaction.

Fixed

• Create column family orderly.

• Remove CRC32 checksum when initializing snapshot in RaftStore thread.

• Get the correct position in the pending vote queue.

• Remove old operator limiter when adding new PriorityKind operator.

Improved

• Use channel to reduce lock contention when pushing task to thread pool.

• Make scheduler more smooth when starting PD.