clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cherry pick #112431 to 25.8: iceberg v2 without seq_num
- Cherry pick #112431 to 26.3: iceberg v2 without seq_num
- Cherry pick #112431 to 26.5: iceberg v2 without seq_num
- Cherry pick #112431 to 26.6: iceberg v2 without seq_num
- optimize_empty_string_comparisons disables skip indexes whose expression compares to an empty string
- SYSTEM FLUSH LOGS for disabled log
- Auto join swap makes ANY LEFT JOIN with OR conditions racy: duplicated and lost left rows under max_threads > 1
- Exact-count projection counts NULL key rows: count() WHERE key != '' contradicts SELECT * on a Nullable primary key (default settings)
- Materialized CTE referenced twice + parallel replicas: replica gets the initiator's _materialized_cte_* temp table name and throws UNKNOWN_TABLE
- Derive the join order randomization seed from the initial query id
- Docs
- C++ not yet supported