clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Join reordering puts 14-20M rows into hash tables in TPC-DS q4, q11 and q74: the UNION ALL filter materialize('s') = 's' is estimated as 1% selective
- Hint drops dependent `DEFAULT`s transitively: `w DEFAULT z + 10` stored as 0
- Skip preparing PREWHERE steps for Parquet files whose row groups are all pruned
- Isolate the filesystem of the server at startup
- Refuse a table function on the right of a `RIGHT JOIN` for parallel replicas when `additional_table_filters` is set
- Aggregate long runs of a single GROUP BY key through the constant-key path
- Unquoted alias `fetch` now fails with SYNTAX_ERROR
- Keep the stable task distribution of object storage files when replicas are balanced
- Add a stateless tests run with plan-based parallel replicas
- Remove the legacy Delta Lake reader
- Docs
- C++ not yet supported