clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix reading Iceberg tables identity-partitioned by a `uuid` column
- Parquet GROUP BY ... LIMIT still reads every row: pass the top-K heap boundary of #121145 to format reads (ClickBench Q18 over Parquet −92%)
- Fix INTERPOLATE reading another column when a target is named like an expression
- Fix `RENAME` and `EXCHANGE` in a `Replicated` database mounted under different local names
- Fix INTERPOLATE expressions that read another INTERPOLATE target
- `hop` functions throw `Time overflow` on NULL rows and `LowCardinality` input
- Readahead pages bypass `max_local_read_bandwidth` on cold scans with `pread`
- Server start hangs or aborts replacing an obsolete `all_*` log table
- `INTERPOLATE` refuses a projection `arrayJoin` under `group_by_use_nulls`
- Seal-gated reading: logical error `filter && filter->isReady()` when the JOIN build side stops early (`join_overflow_mode = 'break'`)
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- C++ not yet supported