clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Stop rebuilding serializations and Nested types per MergeTree reader
- Add JSONEachRowWithNames and JSONEachRowWithNamesAndTypes formats
- Query condition cache serves another session's verdict when an omitted DateTime timezone hides inside a wrapper type: rows silently vanish
- `optimize_injective_functions_in_group_by` drops a constant-NULL grouping key on two-argument `toString(x, NULL)` — silent wrong result
- Iceberg variant type
- Ordered-set cancel guard ignores `source_preserved`, killing partial-result recovery
- Quoting list omits `NOT`/`TOP`/`CUBE`/`ROLLUP`: identifier re-parsed as an operator
- Clamp applied to a copy: nested `use_query_cache` still escapes `readonly`/`CONST`
- Decimal arithmetic silently truncates an integer operand that does not fit the decimal's native width, wrong results at default decimal_check_overflow = 1
- IN over a lower-scale `DateTime64`/`Time64` column silently truncates the set element since 26.4: `dt IN (x)` is true where `dt = x` is false, and pre-epoch values truncate onto the next second
- Docs
- C++ not yet supported