clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- UNIQUE KEY: turn off the top-k and vector index passes
- Cancel mutation tasks that build or wait for a shared `IN` set
- Add a test for an `ALIAS` column that reads an `ALIAS` column declared after it
- Adaptive codec selection: sampling
- Fix compression-aware schema caching for file and URL reads
- Schedule query slots as a space-shared resource
- Make randomized join statistics the same on the initiator and on parallel replicas
- Read Parquet files in clickhouse-local without copying them out of the memory mapping
- Compare aggregate function state constants by function and state
- Tests for twelve MergeTree transaction defects, listed as expected to fail
- Docs
- C++ not yet supported