clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Apply optimize_functions_to_subcolumns in WHERE/PREWHERE on shards of distributed queries
- RESTORE into a lagging ReplicatedMergeTree replica silently duplicates acked data: the emptiness guard reads local state, not Keeper
- Convert only SEMI JOIN to IN in the convertJoinToIn optimization
- `ANY JOIN` returns inconsistent results with `WHERE` clause with `enable_analyzer=0`
- Backport #111483 to 26.3: Restrict local object access only for user files path
- min/max functions do not use min-max index
- UNIQUE KEY accepts a subcolumn, making the table permanently un-insertable
- Dropping a nested column group bypasses every ALTER protection
- GROUP BY returns the same key in multiple rows when the left side of a JOIN is SELECT DISTINCT (parallel_hash + optimize_distinct_in_order
- Does CODEC(Default) mean server's default of table's one?
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- C++ not yet supported