clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- UDF invocations log
- API for query rewrite and formatting
- Recursive CTE does not use index on JOIN key, causing large scans for each recursion step
- Unexpected result of a comparison of FixedString with unequal length if index is involved
- Retire 'parallel_replicas_local_plan' option to make it built-in behavior
- Invalid Parquet Files written by Clickhouse with DateTime64(9)
- Column type SimpleAggregateFunction(any, Nullable(Int8)) has different behavior with Nullable(SimpleAggregateFunction(any Int8))
- Matchers resulved into incorrect type in case of multiple joins with `join_use_nulls`
- restoring a table from a backup does not lead to data duplication
- Fix analyzer: evaluation of scalar from array join
- Docs
- C++ not yet supported