clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support CREATE OR REPLACE TEMPORARY VIEW
- JSON path filter skips granules for a zero-padded FixedString constant
- Perf(String): Skip ASCII chunks in UTF-8 source traversal
- Fix TTL GROUP BY for columns with nested LowCardinality types
- Query-level MemoryTracker over-reports ~14-29x with default `pread_threadpool` local reads, falsely triggering MEMORY_LIMIT_EXCEEDED (241) on a memory-rich server
- DeltaLake: Date casts disable file pruning
- Index for LowCardinality is out of range: Dictionary size is 0, but found index with value 0 (INCORRECT_DATA) while reading part
- Run the real comparison when judging whether a JSON path filter may skip granules
- Perf(SIMD): Speed up find_first_symbols with AVX2
- Fix(TimeSeries): seriesPeriodDetectFFT frequency calculation
- Docs
- C++ not yet supported