clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- No use WHERE LEFT TABLE for RIGHT/FULL JOIN, query very slow, probably full uses table scan
- Settings objects became too big
- Support partial_merge and full_sorting_merge for pre-sorted tables using file/url/s3 engine
- Support specifying field_id for columns when writing to Parquet files
- Systax error on query when using remote_server default_database with distributed_product_mode='local'
- can you implement anyLastMap for SimpleAggregateFunction ?
- MaterializedPostgreSQL Database with ON CLUSTER
- Implement parallel and splittable bzip2 read buffer and apply it to file engine
- Deduplication without `insert_deduplication_token` doesn't work after `ALTER`ing the table
- Support defaults in Native format
- Docs
- C++ not yet supported