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https://issues.apache.org/jira/browse/SPARK-32817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192011#comment-17192011
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Apache Spark commented on SPARK-32817:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/29671
> DPP throws error when broadcast side is empty
> ---------------------------------------------
>
> Key: SPARK-32817
> URL: https://issues.apache.org/jira/browse/SPARK-32817
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Zhenhua Wang
> Priority: Major
>
> In `SubqueryBroadcastExec.relationFuture`, if the `broadcastRelation` is an
> `EmptyHashedRelation`, then `broadcastRelation.keys()` will throw
> `UnsupportedOperationException`.
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