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https://issues.apache.org/jira/browse/SPARK-23574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384475#comment-16384475
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Apache Spark commented on SPARK-23574:
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User 'jose-torres' has created a pull request for this issue:
https://github.com/apache/spark/pull/20726
> SinglePartition in data source V2 scan
> --------------------------------------
>
> Key: SPARK-23574
> URL: https://issues.apache.org/jira/browse/SPARK-23574
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.4.0
> Reporter: Jose Torres
> Priority: Major
>
> DataSourceV2ScanExec currently reports UnknownPartitioning whenever the
> reader doesn't mix in SupportsReportPartitioning. It can also report
> SinglePartition in the case where there's a single reader factory.
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