clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Primary key is not used when an Interval column is compared with an Interval literal of a different unit
- Fix wrong results of constant `pointInPolygon` for polygons with a far-away vertex
- Fix wrong results after external GROUP BY and max_rows_to_group_by>0
- Fix `DateTime64`, `Date32`, `Time` and `Time64` constants past the range of their type in queries sent to remote shards and parallel replicas
- Use indexes when an `Interval` column is compared with an `Interval` constant of a coarser unit
- use_statistics_for_min_max_aggregation falls back to a full scan of the whole table when any part has a lightweight delete
- Performance regression: two-level GROUP BY on a low-cardinality LowCardinality(Nullable(String)) key is 2.3x slower on 26.8
- SIGSEGV when a lambda alias or SQL UDF with an aggregate function is called with a GROUP BY key under group_by_use_nulls
- Fix AES on ppc64le: generate OpenSSL asm with linux64le flavour
- Run automatic parallel replicas last and give parallel replicas the `GROUP BY` top-K heap
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- C++ not yet supported