clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- `Buffer` and `MaterializedView` over a `Distributed` destination return wrong `ORDER BY` results when their declared type differs: the header conversion is applied above the delegated processing stage
- Share effective access rights between sessions of the same user
- A column defined as ALIAS/DEFAULT/MATERIALIZED with a bare IN table expression is accepted at CREATE, then every read throws a Not-ready Set logical error and a mutation referencing it wedges permanently
- DeltaLake (delta-kernel): CREATE TABLE ... ENGINE=DeltaLake blocked forever in SnapshotBuilder::build → read_files → mpmc recv (no timeout); on the DDLWorker thread it wedges the whole distributed DDL queue and cannot be cancelled
- RESTORE ... AS mis-renames table references: several carriers are missed, and the IN right-hand side is renamed when it must not be
- Vector search after a lightweight DELETE returns fewer rows than LIMIT and misses true nearest neighbors, down to an empty result (26.7 regression)
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- C++ not yet supported