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?
- Fix bug in MergeJoin with low cardinality in using
- 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
- "Select * order by {primary key} limit {n}" reads lots of data and consumes a lot of memory
- Iceberg Format: Incorrect Result of COUNT()
- User-Defined Operator support
- Iceberg Format Error: "Not found field"
- Having only a single part in the table may slow everything down
- Docs
- C++ not yet supported