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https://issues.apache.org/jira/browse/SPARK-38237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun reassigned SPARK-38237:
--------------------------------
Assignee: Cheng Su
> Introduce a new config to require all cluster keys on Aggregate
> ---------------------------------------------------------------
>
> Key: SPARK-38237
> URL: https://issues.apache.org/jira/browse/SPARK-38237
> Project: Spark
> Issue Type: Task
> Components: SQL, Structured Streaming
> Affects Versions: 3.3.0
> Reporter: Jungtaek Lim
> Assignee: Cheng Su
> Priority: Major
> Fix For: 3.3.0
>
>
> We still find HashClusteredDistribution be useful for batch query as well.
> For example, we had a case with lower parallelism than expected due to the
> fact ClusteredDistribution is used for aggregation which matches with
> HashPartitioning with sub-key groups (note that the technical parallelism
> also depends on "cardinality" - picking sub-key groups means having less
> cardinality).
> We propose to introduce a new config to require all cluster keys on
> Aggregate, leveraging HashClusteredDistribution. That said, we propose to
> rename back HashClusteredDistribution with retaining NOTE for stateful
> operator. The distribution should not be still touched anyway due to the
> requirement of stateful operator, but can be co-used with batch case if
> needed.
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