clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support `WITH TIES` for negative `LIMIT`
- compareTrackAt() in partial_merge_join for nullables
- Failed to add new rollup rule to existing GraphiteMergeTree table in v25.3
- Long database + table name causing infinite loop
- Pass source row count as cardinality hint for first-run GROUP BY hash table pre-sizing
- Trivial count optimization log table access
- Different predicate-push-down optimizations does not respect short-circuit
- Fix object slicing in `ObjectIteratorSplitByBuckets::next`
- Introduce max_query_size into KQL parser
- fix undercounting of rows_read in query_log system table for iceberg reads
- Docs
- C++ not yet supported