clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: ClickHouse names its metadata file vN.metadata.json on tables that use NNNNN-uuid names, then expire_snapshots and remove_orphan_files refuse to run
- `PostgreSQL` database engine: connection pool settings taken from the creating session are not stored, and a database cannot state them
- S3Queue: keep inherited failed_files_ttl_sec in sync with tracked_file_ttl_sec until set explicitly
- `_block_number` min-max prunes parts under `FINAL`: superseded rows returned
- Show explicit stopped/paused background actions (`SYSTEM STOP`/`SYSTEM PAUSE`) in `system.tables`
- Fix `CompressedReadBufferFromFile::seek` taking a block left by `readBig` for the current position
- Add a performance test for INSERT into a TimeSeries table
- PromQL: accept a phi that is not constant in histogram_quantile
- `DROP INDEX` deletes column marks in pairs the new check admits as legal
- Stop reading early for `ORDER BY` a sorting key prefix with `LIMIT` from 1500 to `max_block_size`
- Docs
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