clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: an INSERT from 26.3 after a newer ClickHouse wrote the table corrupts the manifest list, the table becomes unreadable
- Iceberg writer never trims metadata-log: old metadata.json files can never be removed, storage and commit cost grow with every commit
- Keep the caches of a part when it is moved to another disk
- Do not lose the records of a `FileLog` chunk that fails
- PREWHERE lambda `*` over `USING` gets the key supertype: `LOGICAL_ERROR`
- Optional `variant` column seen as required: pre-`ADD COLUMN` files fail
- 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- `_block_number` min-max prunes parts under `FINAL`: superseded rows returned
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