clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read a subcolumn of a Hive partition column from the path
- Reopen a bounded S3 read whose response ends before the right bound
- Merge chains of `has` and `hasAll` on one array into `hasAny` so a text index answers them once per block
- Schedule all parts of a query as one query in workload scheduling
- CI: plan to move AWS access from job containers to the runner host
- Keep bloom_filter pruning for hasAll with a zero and for float arrayJoin equality
- The insert throttling check walks all active parts of the table under the parts lock on every insert
- A replica queues and executes the GET_PART entries of its own inserts through the fetches pool
- Allow altering index_granularity and index_granularity_bytes on non-replicated MergeTree
- windowFunnel with 'strict_deduplication', 'strict_once' returns different results for the same rows in a different order
- Docs
- C++ not yet supported