clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `WITH` statement inside subqueries
- UDF format option also affects parsing of UDF answer
- coordinate deduplication logic among use cases when async insert is ON by default
- Support for Mac address datatype, similar to UUID support
- Performance degradation with trivial query
- Queries on `DateTime` partitions execute slower unless the query predicate matches the partition function exactly
- Data on s3 disk doesn't get deleted
- Views and materialized view definitions don't change when underlying tables are renamed
- allow_experimental_join_condition - doesn't work for left join
- Setting/feature for auto table drop/delete after a certain amount of time from table creation
- Docs
- C++ not yet supported