clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- EXPLAIN WHATIF undercounts marks for projections with subcolumns
- the first statement in recursive CTE dose not support value()
- Make native Parquet independent of Arrow and enable it in the fast test
- CREATE TABLE in a DataLakeCatalog database with catalog_type = 's3tables' fails on ClickHouse Cloud 26.10, with and without ENGINE
- `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
- Docs
- C++ not yet supported