clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Tests for Iceberg maintenance, nanosecond timestamps and vended credentials refresh
- Correlated EXISTS with an equality on an expression over outer columns (`b.i3 + b.i4 = a.i3 + a.i4`) is not substituted: DISTINCT plus two joins and a second read of the outer table, 3-6x slower than the semi join
- Re-added projection reads stale part from pending DROP PROJECTION
- Projection over a column dropped and re-added in one ALTER serves stale values
- `COPY TO STDOUT` writes `Bool` as `true`; self-connected `postgresql` read fails
- `COPY TO` escapes zero bytes as `\0`, self-connect reads them back as `0`
- Schema inference from PostgreSQL ≤13 fails with array_position error
- Recalculated `checksums.txt` omits projections, breaking `CHECK TABLE`
- File, URL and S3 reads with at least as many files as threads never rebalance after the read, so a file that keeps most rows is processed by one thread (ClickBench Q40 over 100 Parquet files: −17% local, −10% on S3)
- Workload scheduler: possible self-deadlock in AllocationQueue on eviction
- Docs
- C++ not yet supported