clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Carry a higher-order function whose lambda comes from PREWHERE in lazy materialization over joins
- Fix `CANNOT_COMPRESS` for columns bigger than the LZ4 input limit in the query result cache and `Memory` engine
- Fix `_part_offset` and lightweight updates served by a projection that does not store row positions
- Check for timeouts and KILL QUERY between rows in functions of two geometries
- Fix `ALTER UPDATE` lost when queued behind a pending `CLEAR COLUMN` on MergeTree
- `LOGICAL_ERROR` reading Hive partition column `_headers` via `file`
- Compute aggregates over `arrayJoin` without expanding the rows
- Assume Float columns to be distinct, do not build implicit uniq statistics
- Do not prefetch small corners in parquet reader
- Ignore parallel_replicas_allow_in_with_subquery under plan-based parallel replicas
- Docs
- C++ not yet supported