clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Logical Error: Columns are assumed to be of identical types, but they are different in Nullable
- Potential issue: CREATE OR REPLACE VIEW requires privileges on internal temporary table
- UUIDv7 is NOT in a draft status as of September, 2025
- Filter pushdown for left outer joins with `join_use_nulls = 1`
- Logical error: 'Part ... with metadata version 1 contains column h that is absent in table alter_table0
- Azure grant source filter cannot be used to match storage account and container
- Incorrect data on `SELECT` from `metric_log` with `schema_type=transposed_with_wide_view` over `merge()`
- Logical error: 'Bad cast from type DB::ColumnNullable to DB::ColumnVector<char8_t>' with correlated subquery
- Server-side query parameters fail when the parameter name matches a setting (e.g. max_threads)
- `uniqCombined` returns `Nullable(UInt64)` on nullable input
- Docs
- C++ not yet supported