clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Speed up `set` index by adding comparison with min-max values
- recursive CTE primary key optimization for recursive step
- To select a json object from mongodb in clickhouse.
- Fix multiline
- Support bulk filtering for secondary indices
- Issues with persistency in storage `File`/`S3`/… with setting `engine_file_allow_create_multiple_files`
- Add settings `local_filesystem_write_method`
- Apache ORC's logger is incorrect.
- Support new prefetches in `MergeTreeReadPoolParallelReplicas*`
- `Sparse` serialization should be supported for `Nullable`
- Docs
- C++ not yet supported