Zhenhua Wang created SPARK-32817:
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Summary: 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
In `SubqueryBroadcastExec.relationFuture`, if the `broadcastRelation` is an
`EmptyHashedRelation`, when `broadcastRelation.keys()` will throw
`UnsupportedOperationException`.
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