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https://issues.apache.org/jira/browse/SPARK-28345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882712#comment-16882712
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Liang-Chi Hsieh commented on SPARK-28345:
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I found this when doing SPARK-28276.
> PythonUDF predicate should be able to pushdown to join
> ------------------------------------------------------
>
> Key: SPARK-28345
> URL: https://issues.apache.org/jira/browse/SPARK-28345
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Affects Versions: 3.0.0
> Reporter: Liang-Chi Hsieh
> Priority: Major
>
> A Filter predicate using PythonUDF can't be push down into join condition,
> currently. A predicate like that should be able to push down to join
> condition. For PythonUDFs that can't be evaluated in join condition,
> {{PullOutPythonUDFInJoinCondition}} will pull them out later.
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