clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- FS cache related: Having zero bytes, but range is not finished
- Unexpected results for toStartOfInterval with hours INTERVAL
- How about support more embedded KV storage engines
- optimize_move_to_prewhere does not work with Engine=merge -> distributed -> mergeTree
- Mismatch `written_rows` in http interface response
- Support Nested Column Renaming
- Show used UDF at used_functions from system.query_log
- sumMap() is slow and LowCardinality doesn't help
- CANNOT_READ_ARRAY_FROM_TEXT when importing array dumped from Postgres
- ProfileEvents for number of rows in GROUP BY, DISTINCT, ORDER BY, IN, and JOIN states.
- Docs
- C++ not yet supported