clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not convert a column a pending mutation drops
- Fix column names of `untuple` inside a SQL UDF called with an alias
- OOMCanary permanently disables all merges and mutations after one firing: MergeList::cancelAll became sticky with no reset (regression in 3e1b29bef473)
- Analyzer: the `view` table function interprets its body twice
- AsyncLoader/ProcessList: `max_waiting_queries` limit is never enforced (incomplete/dead code)
- text index with a term-preserving tokenizer (array, splitByString) silently drops a String row bearing literal trailing zero bytes for a FixedString(N) constant needle
- `count()` over a `Tuple` float primary key counts every row when the comparison constant holds a `nan` — no `nan` in the data required, the constant-side guard misses tuple-nested floats
- Row silently dropped by `notEquals`: a finer-scale `DateTime64` constant is truncated by index analysis when the sorting or partition key wraps the column in `toString` — the truncated constant prunes the granule or partition holding a live row
- Iceberg + PREWHERE: NOT_FOUND_COLUMN_IN_BLOCK when data files have mixed schema-ids (Parquet V3 reader)
- Support sum/max/avg/quantile over a Variant / Dynamic column without the need for specifying types
- Docs
- C++ not yet supported