clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Analyzer regression: predicate on a GROUP BY key is not pushed to remote shards when reading through an aggregating view over a Distributed table
- Dictionary-based tokenization
- Parse `<valid_until>` from `users.xml`
- Support tuple lexicographic comparison for index analysis
- Prune non-output left columns when a join spill threshold is set
- Restore O(1) reserve in MergeSorter::mergeBatchImpl (fix ORDER BY perf regression)
- Avoid per-row heap allocations in blocked Myers edit distance
- Re-land: make Ctrl+C terminate the output of a result set in the client promptly
- Add test: UNION-bodied `MATERIALIZED` CTE used directly in `IN` (`resolveUnion` branch + union correlation check) untested
- Support DEFAULT expressions inside Tuple data types
- Docs
- C++ not yet supported