clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- round and group by produces duplicated 0
- parallelize_output_from_storages: number of threads is not capped by max_threads setting
- [WIP] Balancing replicas during BACKUP ON CLUSTER better
- ANTI LEFT JOIN possibly incorrect result with NULLs
- trivial view on top of distributed table can significantly impact the performance of some queries
- Can the features of Query Cache support subqueries?
- define the rule which value has effect when several cgi values for param have been set
- Collect stderr in UDF, executable tables, and dictionaries.
- 01443_merge_truncate_long hungs
- Support ORDER BY 1,3,5 and ALL syntax in create table
- Docs
- C++ not yet supported