clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- MergeTree reads build the same PREWHERE steps once per stream: build them once per read (ClickBench Q42 -5.7%, Q41 on 20 parts -5.8% at max_threads=16)
- Park three macOS test hosts in runner-init and log its output to a file the CloudWatch agent tails
- Lazy materialization reads the deferred columns with only as many threads as the main read has streams: let its readers use max_threads (ClickBench Q23 −23%, SELECT * ... LIMIT 10 −28%)
- Fix missing rows from JOIN runtime filter index analysis when the probe key nests a CAST
- Bring 04666_run_query_in_background under 10 s by overlapping its CREATE AS SELECT populates with the other cases
- Investigate `_FORTIFY_SOURCE=3` compatibility and release cost
- Do not let a derived `indexHint` keep `HAVING` above `GROUPING SETS`
- Do not infer join conditions through constant join keys in join reordering
- Iceberg reads do not skip data files using JOIN runtime filters: star joins on date-partitioned tables open every file
- Audit whole-binary BTI, CET, and GCS readiness
- Docs
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