clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cherry pick #98792 to 26.1: Fix crash in system tables
- system.query_log.used_row_policies is empty for VIEW and subquery queries
- Unity Catalog integration cannot read streaming tables or materialized views (missing storage location)
- Prometheus HTTP handler endpoints do not increment rows/bytes metrics during inserts or selects, and do not send queries to system.query_log.
- optimize_inverse_dictionary_lookup does not work for conditions IN
- Avoid locks in Keeper mntr 4LW command
- [CI crash] SortingQueueImpl construction failure during merge sort
- Backport #99108 to 25.12: Fix crash during ALTER TABLE REMOVE SETTING in iceberg
- Backport #98464 to 25.8: Fix ARRAY_JOIN row count mismatch in partial evaluation during outer-to-inner join optimization
- Backport #98464 to 25.12: Fix ARRAY_JOIN row count mismatch in partial evaluation during outer-to-inner join optimization
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- C++ not yet supported