clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [RFC] Introduce `gporca` into ClickHouse for optimizing query sql
- Allow setting up prefer_fetch_merged_part_size_threshold without the time threshold
- DISTINCT tuple(a, b) doesn't use DISTINCT in order optimization
- limit 0 performance issue .
- why insert into distributed table per shard directly is slower than insert into distributed table?
- KafkaConsumersInUse can have negative values
- Improvements for DISTINCT in order
- [WIP] Use simdjson on-demand API
- min_bytes_to_use_direct_io has no effect
- Test `test_s3_zero_copy_on_hybrid_storage` is flaky (disabled)
- Docs
- C++ not yet supported