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https://issues.apache.org/jira/browse/SPARK-24891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553271#comment-16553271
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Apache Spark commented on SPARK-24891:
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User 'maryannxue' has created a pull request for this issue:
https://github.com/apache/spark/pull/21851
> Fix HandleNullInputsForUDF rule
> -------------------------------
>
> Key: SPARK-24891
> URL: https://issues.apache.org/jira/browse/SPARK-24891
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Maryann Xue
> Priority: Major
>
> The HandleNullInputsForUDF rule can generate new {{If}} node infinitely, thus
> causing problems like match of SQL cache missed.
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