clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix(GeoParquet): Preserve Geometry columns in Parquet output
- Join reordering estimates multi-key joins from their most selective key; reusing a join's observed selectivity (opt-in) makes TPC-DS q17, q25 and q29 1.9-2.6x faster
- Fix mutations hanging after an expired part of a ReplicatedMergeTree table is replaced with an empty part
- Read the dates of rotated span logs correctly in system.all_opentelemetry_span_log
- Fix Parquet pruning that skips rows when inverted UInt64 statistics are read as DateTime
- External `LIMIT BY`
- Fix `CURRENT_DATABASE` and other functions written without parentheses being evaluated on remote servers
- [Umbrella] Nightly fuzzer failures: SQLancer, SQLancer++ and the data lake fuzzer
- Prune ORC row groups by predicates on a monotonic function of a column
- Fix `sumMergeOrNull` rejecting `sum` states
- Docs
- C++ not yet supported