clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `CAST` from nested arrays to geo types, and between geo types (`Polygon` -> `MultiPolygon`)
- Fixed-width text input format
- CSV: delimiter auto-detection and decimal comma
- Skip comment lines in CSV/TSV input
- `SAMPLE` for table functions and files
- `ASOF JOIN` on `IPv4`/`IPv6` columns and without an equality condition
- Reading Mapbox Vector Tiles (MVT)
- `clickhouse-local`: allow `--queries-file` together with `--query`
- GeoParquet output: write the `bbox` metadata and a bbox covering column
- YAML input format
- Docs
- C++ not yet supported