clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Distributed tables: user accessing the local shard is always the querying user, regardless of the user specified in the cluster definition.
- Insert error with DEFAULT expression
- Implement digits function
- JSONAnalyze aggregate function
- Allow to use arbitrary queries (e.g. DESCRIBE) in a subquery
- Transfer less amount of data over network for distributed aggregation query with ORDER BY sublinear aggregate functions DESC and LIMIT
- Optimization for distributed GROUP BY with ORDER BY without aggregate functions.
- Query optimization: rewrite GROUP BY with LIMIT to DISTINCT.
- Streamable serialization format (suggestion)
- Implementing rolling operations for unevenly spaced time series
- Docs
- C++ not yet supported