clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix quadratic gzip/zlib streaming decompression of single-block streams
- Logical error "Bad cast from type DB::ColumnVector<int> to DB::ColumnTuple" in `fillMissingColumns` reading `size0` subcolumn after `CLEAR COLUMN` of a `Nested` `Tuple` element (stress, STID 3227-42db)
- BACKUP to S3: a crash after the .lock PUT permanently wedges the destination (BACKUP_ALREADY_EXISTS 'is being written already'), no in-server recovery
- Arrow output serializes Enum as raw integers, dropping the names. No opt-out, unlike other data formats as Parquet.
- Prometheus HTTP API: implement /api/v1/metadata
- Add setting to use packed storage for parts in busy partitions
- Fix vector search with `arrayJoin` below the sort and with a row policy
- Add table schema to SQLInsert output
- Iceberg with iceberg_use_version_hint=1: a crash between the vN.metadata.json PUT and the version-hint.text advance permanently wedges all future INSERTs (DATALAKE_DATABASE_ERROR)
- Disable the map element to subcolumn rewrite by default and revert the PREWHERE grouping change
- Docs
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