clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `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
- Add reproducers for the AllocationQueue self-deadlock on eviction
- Fix heap-use-after-free after a streaming read round whose sort spilled to disk is torn down
- Refuse RENAME DATABASE for detached and not loaded S3Queue/AzureQueue tables whose keeper_path expands {database}
- Use the top-K heap boundary of GROUP BY ... LIMIT to filter Parquet reads
- Docs
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