clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Temporary tables created by Clickhouse can lead to query fail if they exceed max_[table/partition]_size_to_drop
- Unable to `CREATE USER` with appropriate configs set
- Select queries with `array join` and `where 0` reads a lot of rows.
- Crash in Mac OS over postgresql interface
- Allow PR AUC to be calculated in parallel
- More options for [S3/Azure]Queue table engines
- More virtual columns for the S3 storage
- `merges_mutations_memory_usage_to_ram_ratio` use total physical memory, not cgroups limited one
- Clickhouse returns `FILE_DOESNT_EXIST` for hdfs path with wildcards when using `HAVING`
- Preserve blobs when zero copy lock does not exist
- Docs
- C++ not yet supported