clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `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)
- `JSONExtract` of an array from `Nullable(String)` fails: `Nested type Array(...) cannot be inside Nullable type`
- A missing file in `FROM 'file.json'` gives `Unknown table expression identifier`
- `url`/`s3` table functions reject URLs with spaces: `Bad URI syntax: URI contains invalid characters`
- Parquet files written by ClickHouse are much larger than DuckDB's (bloom filters and dictionaries on unique columns)
- GeoPackage input and output format
- Docs
- C++ not yet supported