clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `DataLakeCatalog()` with Polaris REST catalog duplicates S3 path prefix causing 404 errors
- More profile metrics for Iceberg, S3 and Azure
- A query does not work with parallel replicas (Unknown expression or function identifier)
- Implement iceberg metadata cache for using last modify time
- Support dynamic timezone argument for toYear, toMonth, toDayOfMonth etc.
- S3ReadRequestsCount significantly differs (x2) for Iceberg tables between 25.11 and head
- libFuzzer tests are flaky
- The Ubsan AST fuzzer dies from time to time with `Trying create stream to read to mark`
- Clickhous CLI Client: UPDATE/INSERT does not respect \ (backslashes)
- "Cache" analytical(aggregate) function `getResult` for if window expression wasn't changed)
- Docs
- C++ not yet supported