clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `SYSTEM SYNC MERGES` hangs forever when scheduled parts don't exist or are dropped
- Vectorise `MD5` with multi-buffer SIMD implementation
- `countmin` statistics give wrong estimates for `Float32` columns due to hash mismatch between column and Field storage
- `checkDropOrRenameCommandDoesntAffectInProgressMutations` doesn't detect conflict between `DROP STATISTICS` and `MATERIALIZE STATISTICS ALL`
- `mysqlAmericanDate` uses unconditional `+2000` for year instead of proper 2-digit year conversion
- `join_any_take_last_row` not propagated to `ConcurrentHashJoin` and AUTO fallback `HashJoin`
- Missing `decompress` call in `tryGetSubcolumnFromBlock` causes crash with compressed Memory tables
- `evaluateScalarSubqueryIfNeeded` called too late, missing tuple-rewrite edge case
- `matchIsNullOfTwoArgs` incorrectly treats `notEquals` as semantically neutral with IS NULL
- `StorageJoin` cast skipping in `buildJoinClausesAndActions` fails when `StorageJoin` has smaller type than left table
- Docs
- C++ not yet supported