clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `.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`
- `schema_inference_mode = 'union'` reads metadata of remote files sequentially (3 min 22 s for 1,353 S3 files)
- Subcolumn access fails on a `Geometry` function result: `readWKB(x).Polygon`
- `Unknown expression or function identifier 'h3_3'. Maybe you meant: ['h3_3']`
- `formatDateTime` does not support `%U` (week of year, Sunday-based)
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