clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` in `optimize_injective_functions_in_limit_by` when the `LIMIT BY` key carries an alias
- Test that a text index matches a startsWith/endsWith needle literally
- Fix a valid `JOIN ON` rejected by common-expression extraction when a `Nothing` operand is absorbed
- Iceberg mutations write position delete files that reads apply to many data files; one file per data file cuts `apply_patch_parts_merge` reads by 89–91%
- Fix vector search with `FINAL` returning stale row versions without rescoring
- Wrong result: MATERIALIZED CTE read by a scalar subquery with UNION ALL, then by another scalar subquery, is empty for a later self-join
- Do not plan `Merge` tables excluded by a pushed-down `_table` filter in the `topKThroughJoin` probe
- Do not apply `additional_result_filter` to `EXISTS` subqueries
- Do not let an `indexHint` on the time column prune a GraphiteMergeTree FINAL read
- Run the amd_release master_head performance comparison in 8 batches
- Docs
- C++ not yet supported