clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- kill query cannot execute query in readonly mode with 'on cluster'
- Can max_rows_in_distinct works in Insert into xxx select distinct * from yyy
- Clickhouse consuming unexpected amounts of memory.
- Map combinator with 2+ argument aggregate functions hard to use (argMaxMap)
- Even simpler data upload.
- Aggregate function that returns a type that cannot be Nullable should still be supported for `aggregate_functions_null_for_empty`
- [MySQL Interface] ClickHouse should use Binary characterset for String/FixedString columns instead of UTF8
- Parallelize pipeline for queries that use aggregating projections
- gRPC Interface not returning `rows_before_limit_at_least` using format JSON
- Select count cost much more time because subquery
- Docs
- C++ not yet supported