clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `_distance` rewrite ignores `i8`/`b1` quantization: index units, not distances
- Building IN set from literals ~1.8x slower for wide-int and Date* keys
- `Filesystem` database rejects all tables when `user_files_path` is a symlink
- `GROUP BY` top-K filter misses the #122486 name check: stored column reads `1`
- Memory/Merge/View return stale Polygon array sizes after MultiPolygon promotion
- Unrewritten parts serve old `.sizeN`/`length` after `MODIFY COLUMN` to `Multi*`
- Parameterized alias `AS {a:Identifier}` lost after view/handler re-parse
- Row policy with DateTime64/Time64 query parameter re-parses to wrong value
- Parquet: read columns with the legacy null converted type 24
- A table created `AS postgresql(...)` or `AS mysql(...)` takes its connection pool settings from the context that loads it, so they change after a restart
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- C++ not yet supported