clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `should_skip_column_operation` uses `has` instead of `has || hasNested`, causing `DROP COLUMN IF EXISTS` to silently skip flattened Nested columns
- `expandLimitByAll` skips entire mixed expressions instead of extracting non-aggregate subexpressions as documented
- `FunctionComparison::getConstantResultForNonConstArguments` missing `isNothing(result_type)` guard — same bug class as PR fix
- Discover columns in distributed
- Fix row policies usage for Merge table + child table
- query cache for LIMIT and ORDER BY
- feat(formats): Add OpenMetrics text format (read/write).
- label for programmatically generated issues/pr
- S3 disk access check failure during startup produces unclear error logging
- `YYYYMMDDhhmmssToDateTime64` missed by pre-epoch fractional seconds fix — still uses old `decimalFromComponents<DateTime64>`
- Docs
- C++ not yet supported