clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Hardcoded 'default' in symlink path causes data loss with custom default_database
- block.clear() in set index deserializeBinary destroys reused granule structure, disabling non-bulk index filtering
- UnionNode::updateTreeHashImpl ignores ignore_cte option, causing same distributed IN hash mismatch for UNION CTEs
- expandSelectorGlobImpl early-returns without expanding single-char enum when path also contains range glob
- isFloat() in read-in-order optimization doesn't unwrap LowCardinality, causing wrong ORDER BY for LowCardinality(Float64) with NaN
- Add groupBloomFilter aggregate function and bloomFilterContains scalar function
- Nullable wrapping bypassed for geo columns when allow_geoparquet_parser=false in Arrow-based reader
- CROSS JOIN decorrelation path multiplies aggregate values by duplicate count of correlated column values
- WKT MULTILINESTRING parsing calls parseWKTPolygon, returning wrong geometry type
- Table engine `QueryRunner`
- Docs
- C++ not yet supported