clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support DEFINER / SQL SECURITY for dictionaries
- Stop retrying S3 reads after query cancellation
- Fix wrong results for non-boolean conditions taken out of `and`
- Deduplicate the final DISTINCT in parallel
- Lazy FINAL with `optimize_aggregation_in_order` merges one group at a time (25000 `mergeBlocks` calls and 50000 log lines for a 35000-row table)
- IN (SELECT ...) inside a higher-order-function lambda always evaluates to 0 when the query is a derived table or the lambda is in WHERE
- RESTORE: a mid-attach I/O error leaves an un-rolled-back durable data prefix; the suggested allow_non_empty_tables retry duplicates it
- Row policy over a file-backed table breaks `DEFAULT` columns missing from the data file (`UNKNOWN_IDENTIFIER`; silently wrong results on 26.7)
- Backport #112573 to 26.5: Fix async bounded read buffer readbigat race
- Aggregation: precompute hashes and prefetch for preallocated hash-table variants (up to 1.5x on multi-key GROUP BY)
- Docs
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