clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add byte-weighted bytes_to_do and progress to system.mutations
- Iceberg writer declares `timestamp` (without zone) in metadata but writes Parquet with `isAdjustedToUTC=true` — CH-written tables with DateTime are unreadable by pyiceberg
- Avoid repeated EXPLAIN ANALYZE clock lookups for staged processors
- Don't wait for a replica's announcement to cancel it
- Fix `optimize_inverse_dictionary_lookup` for single-column complex keys wrapped in `tuple`
- Paimon incremental read: a Keeper watermark left ahead of the warehouse (e.g. after restore) silently and permanently skips committed data
- DeltaLake: trivial `SELECT count()` over a table with deletion vectors counts the deleted rows (`numRecords` summed, DV cardinality ignored)
- Coordinate a read with pinned block numbers in classic parallel replicas
- SAS token in the URL argument of AzureBlobStorage / azureBlobStorage is not masked in SHOW CREATE, engine_full and query_log
- Support Nullable(JSON) in tupleElement
- Docs
- C++ not yet supported