clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `Geometry` columns are written to Parquet as UTF-8 strings without GeoParquet metadata
- Parquet output with high ZSTD levels uses about 0.8 GB of memory per encoding thread (70+ GB at level 22)
- `clickhouse-local` counts memory of the whole session cgroup as its own RSS
- `toTimeZone` with a non-constant time zone (`allow_nonconst_timezone_arguments = 1`) silently returns unshifted values
- `.json` files with JSON Lines are auto-detected as the `JSON` format, which is 2x slower than `JSONEachRow`
- Reading a few columns of a remote Parquet file with many small row groups downloads almost the whole file
- `areaCartesian`/`areaSpherical` return negative values for counterclockwise rings (the OGC/GeoJSON orientation)
- `geoToH3` rejects integer coordinates and a non-`UInt8` resolution
- `-0.` and `0.` are different keys in `GROUP BY`
- `schema_inference_mode = 'union'` fails on different geo types (`Point` vs `Polygon`) instead of unifying them into `Geometry`
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