clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reject duplicate storage namespaces within a policy
- Deduplicate the LowCardinality/Nullable unwrap in monotonicity analysis
- Fix wrong results in `optimize_redundant_comparisons` for `Variant` expressions
- Backport #109932 to 26.6: Fix crash in direct JOIN over MergeTree with PREWHERE (shared PrewhereInfo corrupted by column pruning)
- Offset-based parallel replicas fan out onto replicas of a non-replicated MergeTree, ignoring `parallel_replicas_for_non_replicated_merge_tree` and `parallel_replicas_only_with_analyzer`
- `WINDOW VIEW` cannot receive inserted data: pushes from the source table are silently skipped, direct inserts fail with `std::out_of_range`
- Fix TTLDrop merge of a table with a text index or an inert index
- Fix data loss and silent behaviour changes in databases with lazy_load_tables
- Statistics-based part pruning drops NaN rows: NOT (f < c) prunes a part whose only matching rows are NaN — silent empty result at default settings
- rewrite_in_to_join breaks repeated identical aliased IN expressions: MULTIPLE_EXPRESSIONS_FOR_ALIAS on a query that is valid without the rewrite
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