clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Optimize higher order functions and array join with LowCardinality columns
- Query complexity restrictions ignored in CREATE TABLE queries
- groupBitmapMergeState behave not the same with groupBitmapOrState
- multiple disks on the same volume are unbalanced
- group_by_each_block_no_merge setting
- Add a constructor for named tuples, eg. tuple(x=1, y=2) or tuple(1 as x, 2 as y)
- Cluster LDAP: Unable to map external roles
- Local ContextPtr may stuck in IndicesDescription holding some shared pointers
- If I use executable UDFs, queries may stuck
- pointInPolygon and IN operator causing full table scans on Point indexes
- Docs
- C++ not yet supported