clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Delay backporting until 7 days after merge and skip reverted PRs
- Npy format: SELECT count() disagrees with SELECT * for arrays with zero inner dimension
- Parquet v3 native reader: page-level filter pushdown not effective for IN (subquery) on sorted Iceberg/Parquet data
- Unstable performance tests: 61 tests show >10% noise in >10% of master runs
- Aggregate result materialization causes 1.5x peak RSS spike from PODArray realloc doubling
- Quota KEYED BY normalized_query_hash: MAX errors limit never enforced
- use_skip_indexes_on_data_read=1 bypasses skip indexes on tables with projections
- Quota KEYED BY normalized_query_hash: I/O resource limits not isolated per hash
- parallel_distributed_insert_select default value of 2 is a silent source of errors
- Enhance Keeper dashboard CLI with tab completion and path validation
- Docs
- C++ not yet supported