clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- clickhouse doesn't seem to properly load backup config file
- Optimize higher order functions and array join with LowCardinality columns
- Clickhouse scanning huge amount of data while querying parquet files even in the latest build which has predicate pushdown
- Query complexity restrictions ignored in CREATE TABLE queries
- groupBitmapMergeState behave not the same with groupBitmapOrState
- Parameters in parameterized views cannot be used as column names
- Parameterized views cannot forward parameters to other parameterized views
- multiple disks on the same volume are unbalanced
- Add TTL cache policy for metadata cache of inverted index
- group_by_each_block_no_merge setting
- Docs
- C++ not yet supported