clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- keeper-client commands are resource inefficient
- ISSUE: IMPORT from s3 parquet with where statement (LESS ROWS COUNT INSERTED)
- `http_receive_timeout=0` causes connection failures despite docs claiming it means "infinite timeout"
- Add support for CONNECT_ATTRS and SESSION_TRACK MySQL connection features
- Logical error: Can't extract iceberg table state from storage snapshot for table location
- `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.
- Docs
- C++ not yet supported