clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Some merges may still stuck?
- Should merge join change to TemporaryDataOnDisk?
- Missing columns on: INSERT INTO ... SELECT c1 FROM file('test.parquet') WHERE c2>0
- alternative GroupArray aggregation function which consumes less memory by using singly linked table
- User-Defined Operator support
- Iceberg Format Error: "Not found field"
- Support reading ORC file in parallel
- ClickHouse randomly getting stuck during the "Access granted" stage
- Implement Write Ahead Log for System logs
- windowFunnel `strict_increase` behaves incorrectly if there is chain with events with the repeating subchain
- Docs
- C++ not yet supported