clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Let a comment command in the same ALTER see the columns MODIFY QUERY introduces
- ACCESS_DENIED (Code 497) with column-level grants under default optimize_empty_string_comparisons and optimize_functions_to_subcolumns on 26.6
- Support Prometheus native histograms in the `TimeSeries` table engine
- Refuse INSERT into a Unity Catalog managed Delta table up front
- Rewrite mutation DateTime literals for folded IN lists, qualified columns and nullIn
- Preserve the empty-state row when hoisting a constant out of an aggregate
- Text index: serve `position(s, 'x') > 0` as `s LIKE '%x%'`
- WITH FILL emits rows outside FROM..TO when STEP overflows the column type
- ARRAY JOIN in an IN subquery splits the GROUP BY key: wrong ROLLUP row
- Fix reading ssd_cache dictionary entries from disk
- Docs
- C++ not yet supported