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https://issues.apache.org/jira/browse/SPARK-20441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Burak Yavuz resolved SPARK-20441.
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Resolution: Fixed
Resolved with https://github.com/apache/spark/pull/17735
> Within the same streaming query, one StreamingRelation should only be
> transformed to one StreamingExecutionRelation
> -------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-20441
> URL: https://issues.apache.org/jira/browse/SPARK-20441
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.1.0, 2.1.1, 2.1.2, 2.2.0
> Reporter: Liwei Lin
>
> Within the same streaming query, when one StreamingRelation is referred
> multiple times -- e.g. df.union(df) -- we should transform it only to one
> StreamingExecutionRelation, instead of two or more different
> StreamingExecutionRelations.
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