clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- When working with a large cluster, client uses too much network for metrics information
- `uniqCombined` is wrong
- when using Engine=MySQL for table or database - can i hint ClickHouse to pass WHERE condition to underlying MySQL?
- Add Flatbuffers output format
- Allow to attach partitions from a different disk.
- The concept of feature categories or tiers
- Incorrect error when an alias is duplicated in a subquery
- Leaking memory in MemoryTracker during long running ingestion (55.59 GiB in query tracker vs 16GB in global memory tracker)
- `Table is in readonly mode due to shutdown` after DROP DATABASE with Replicated table and size bigger than `max_table_size_to_drop`
- Connections from PostgreSQL connection pools are not reused within a single query or other concurrent executing queries
- Docs
- C++ not yet supported