clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- full sorting merge join sets used for filtering will use table index
- asterisk_include_alias_columns is ignored when asterisk prefixed with table name
- clickhouse doesn't seem to properly load backup config file
- 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
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- C++ not yet supported