clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Send time zone in `update_field` for HTTP source of dictionaries
- avg(bigint) returns incorrect result when overflow
- Setting `parallel_distributed_insert_select=2` is not always executing `INSERT SELECT` on all hosts
- GLOBAL IN/IN different results for double-distributed IN subquery
- Enhancements for parallel replicas protocol
- Analyzer: Do not execute scalar subqueries when `SelectQueryOptions::only_analyze` is set
- Show estimates for Distributed table
- Dictionary source QUERY gets wrong data if PK is not a FIRST column of dictionary
- Ability to specify download threads for s3 functions
- Support output hive text format
- Docs
- C++ not yet supported