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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/06/09 05:39:00 UTC
[jira] [Assigned] (SPARK-35690) Stream-stream join keys should be
reordered properly
[ https://issues.apache.org/jira/browse/SPARK-35690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-35690:
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Assignee: (was: Apache Spark)
> Stream-stream join keys should be reordered properly
> ----------------------------------------------------
>
> Key: SPARK-35690
> URL: https://issues.apache.org/jira/browse/SPARK-35690
> Project: Spark
> Issue Type: Documentation
> Components: Structured Streaming
> Affects Versions: 3.2.0
> Reporter: Cheng Su
> Priority: Minor
>
> For query with multiple stream-stream joins, unnecessary shuffle can be happened as we don't reorder join keys for stream-stream join. We already reorder join keys for shuffled hash join and sort merge join, so we can also have it for stream-stream join - [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala#L232] .
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