clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Select From `postgresql` engine: destructor of `pqxx` leads to a null pointer dereference
- Distributed table distribution tasks delay startup time
- `right` with large negative `offset` returns the whole string instead of a empty string
- S3 table function doesnt work with `columns()` function
- The behavior of the AND operator in the WHERE clause differs between local tables and distributed tables.
- A new aggregate function, `estimateCompressionRatio`
- [WIP] Optimize the performance of full sorting merge join by shuffling
- Parts with old TTL after MODIFY TTL with materialize_ttl_after_modify=0 are not moving
- Simplify hash function usage as default value in table definition.
- No retries in case of exception when reloading dictionaries with lifetime=0
- Docs
- C++ not yet supported