clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- External Iceberg Read Issue with Equality Deletes
- A shortcut: if you do trivial SELECT from a single file from a File engine, with the same FORMAT over HTTP, return the file as is
- force_index_by_date throws INDEX_NOT_USED exception with parallel replicas and view
- Analyzer regression: predicate on a GROUP BY key is not pushed to remote shards when reading through an aggregating view over a Distributed table
- Per-column marks caching for compact parts to reduce cache blow-up
- 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)
- Docs
- C++ not yet supported