clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Multi-stage distributed queries
- Add RESET SESSION statement
- 3-arg `LIKE ... ESCAPE` bypasses primary key and text index conditions due to arity-gated rejection
- [CI crash] Incorrect column comparison during sorting
- Add IColumn::updateHashWithValueCanonical for compareAt-compatible hashing
- ALTER MODIFY COLUMN after a lightweight DELETE fails when soft-deleted rows hold unconvertible values
- Fix NormalizeQuery dropping unary +/- before non-literal tokens after…
- RFC: Reduce per-block IColumn allocation overhead during Shuffle with `computeHashInto` + `scatter_into`
- Add test for incorrect results when OR combines skip index types set + ngrambf_v1 with LowCardinality(Nullable)
- Fix subquery handling for Parquet
- Docs
- C++ not yet supported