clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read the Graphite rollup columns for FINAL
- `set` index drops matching granules: rebound `indexHint` alias bound by name
- GROUPING SETS HAVING loses primary-key pruning after #126219
- Build with libc++ `EXTENSIVE` hardening
- Make the remembered verdict of `05324_adaptive_aggregator_disable_thaw` independent of how `numbers_mt` splits rows
- Bound each docker-library test run in the Docker image jobs
- Join reordering costs a many-to-many join as a key lookup when NDV statistics are missing: TPC-H Q5 times out on repeat runs
- Run the bare-binary clickhouse-local calls of tests 03134, 03267 and 03536 with a per-test HOME
- Join reordering: without NDV, assume the smallest table joined on a key holds the unique key
- Let the adaptive aggregator thaw under the top-K pruning of `ORDER BY count() DESC LIMIT n`
- Docs
- C++ not yet supported