clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- DataLakeCatalog: create and drop a namespace
- Json array subscript index not working
- Read Map key subcolumns through views and subqueries
- `SQL_ASCII` client_encoding rejected: C-locale interactive `psql` can't connect
- Reject a non-constant time zone argument in toTimeZone
- Iceberg sort key drops `null-order`; read-in-order returns NULLs first
- Calculate the S3 upload checksum over the staged part buffer
- Parquet: a LIKE filter pushed into the scan searches PLAIN string pages one value at a time; batching the search makes ClickBench Q21 30-45% faster with AVX2 or NEON kernels (Zen 3, Graviton4), 15-20% with AVX-512, 6-9% with SVE (Graviton3)
- Fix JSON array subscript optimization to subcolumn when table has index
- `SAMPLE` + vector index: `prefilter` and fetch multiplier ignored, rows lost
- Docs
- C++ not yet supported