clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix a hang, excessive memory usage and a crash on a filtered read of a Parquet file with a malformed schema
- Fix isNotDistinctFrom reporting NaN as equal for Nullable operands
- Rebuilt columns.txt takes types from live metadata; guard checks names only
- Replace experimental settings by settings alias in tests
- Key the metadata-replay exemption of `PostgreSQL`, `MaterializedPostgreSQL` and `DataLakeCatalog` database engines on the loader flag
- Only weaken a non-computable conjunct where the projection filter's polarity is positive
- Fix incomplete TinyLog reads when one data file ends before the others
- Refactor Adaptive Aggregator
- Filtered LIMIT 1 BY subquery with an outer IN is ~2.5x slower (26.6 -> 26.8)
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` when an equi-key filter is pushed through a `FULL JOIN ... USING` chain
- Docs
- C++ not yet supported