clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- BACKUP tar archive - implement compression_method and compression_level
- Repair non-monotonic buckets in quantilePrometheusHistogram like Prometheus
- Skip remote-write series without a metric name instead of failing the request
- Resolve PromQL function names generically
- Count exemplars dropped by Prometheus remote write
- Forbid renaming the source of incremental refreshable views
- Derive IS NOT NULL filters at table scan from joins and filters in the plan
- `MergeTreeReaderWide` derives the stream name once per `readRows`
- `CompressionCodecMultiple` keeps its sub-codecs across blocks
- `ColumnLowCardinality::getPermutationImpl`: counting sort by dictionary position
- Docs
- C++ not yet supported