clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- MergeMutate pool permanently wedges on addFuturePartIfNotCoveredByThem
- PR's fix is incomplete: `replaceToConstants` (line 159) recurses into correlated subqueries unguarded, replacing ColumnNodes in `correlated_columns_list` with ConstantNodes, causing `Bad cast from type DB::ConstantNode to DB::ColumnNode` LOGICAL_ERROR
- Improve vector similarity search performance with binary quantization
- Cannot recover from read_only mode
- `normalizeQueryToPODArray` silently drops unary `+`/`-` before non-literal tokens after a comma
- ODBC bridge response truncated mid-row when `parallelize_output_from_storages=1` and `max_threads>=2` over a view (CANNOT_READ_ALL_DATA)
- `OptimizeGroupByInjectiveFunctionsPass` trusts `toFixedString::isInjective=true` and produces wrong GROUP BY counts when input strings of different lengths zero-pad to the same FixedString
- `KEYED BY normalized_query_hash` quotas track READ_ROWS/READ_BYTES/RESULT_ROWS/RESULT_BYTES/EXECUTION_TIME/WRITTEN_BYTES on shared session intervals, defeating per-hash isolation
- Database level CLONES
- ReaderExecutor: pipeline-based read orchestration
- Docs
- C++ not yet supported