clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add experimental cuckoo_filter and binary_fuse_filter skip indexes
- FilterTransformPassedBytes counts pre-filter column sizes at line 247
- getCreateDatabaseQueryImpl skips empty comment overlay, causing cleared comments to persist in metadata file
- ALTER TABLE MODIFY TTL with DateTime silently causes data loss on 32-bit overflow
- Implement Sparkbar aggregation combinator
- trimColumnIdentifier uses rfind('.') which over-strips Nested column prefixes in JOIN output
- Add per-query/per-user setting to limit open files
- RFC: Parallel Keeper Snapshot Reads via Chunked ZSTD Frames
- Iceberg UPDATE phase writes full data_block to each partition, causing row duplication when partition key changes to multiple values
- Missing decompress() in tryGetSubcolumnFromBlock dynamic structure path causes segfault
- Docs
- C++ not yet supported