clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Potential Issue: EXPLAIN QUERY TREE statement does not check permissions on the table
- Take into account system resources when opening connections in `HTTPConnectionPools`
- Clarification on finalizeAggregation Behavior with quantile Function in AggregatingMergeTree
- Advice on Efficient Aggregation Without Joins or Window Functions
- avg Returns NULL Instead of NaN on Empty Nullable Column
- toStartOfMinute only supports a small range of DateTime64
- Max and min aggregate functions should take advantage of the sort key
- Idea: stratified sampling
- Kafka engine settings in config.xml are not respected
- Speed up GROUP BY for large states
- Docs
- C++ not yet supported