clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [Experiment] Disable ditry pages in jemalloc and see what happen
- max_key_range=65536 too restrictive: legitimate DDSketch queries fail with INCORRECT_DATA
- kql_array_sort null_last=false uses only first row's NULL index for all rows
- Include `rows_before_limit_at_least` in `X-ClickHouse-Summary` header
- caseWithExpression transform path gives wrong results when both expression and WHEN value are NULL
- ToDateMonotonicity uses DATE_LUT_MAX_DAY_NUM (65535) for toDate32, but toDate32's actual boundary is DATE_LUT_MAX_EXTEND_DAY_NUM (120530)
- cast_not_needed for DateTime64+integer causes Range::shrinkToIncludedIfPossible to step by 1 second, silently dropping subsecond rows
- PR's fix is incomplete: before_interpolate_actions outputs not preserved in LIMIT BY step when WITH FILL + INTERPOLATE + LIMIT BY combined
- Add test: No test coverage for skip_unused_shards through nested views
- Table function `eval`
- Docs
- C++ not yet supported