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https://issues.apache.org/jira/browse/SPARK-34096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264649#comment-17264649
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Apache Spark commented on SPARK-34096:
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User 'beliefer' has created a pull request for this issue:
https://github.com/apache/spark/pull/31178
> Improve performance for nth_value ignore nulls over offset window
> -----------------------------------------------------------------
>
> Key: SPARK-34096
> URL: https://issues.apache.org/jira/browse/SPARK-34096
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: jiaan.geng
> Priority: Major
>
> The current
> {code:java}
> UnboundedOffsetWindowFunctionFrame
> {code}
> and
> {code:java}
> UnboundedPrecedingOffsetWindowFunctionFrame
> {code}
> only support nth_value that respect nulls. So nth_value will execute
> {code:java}
> updateExpressions
> {code}
> multiple times.
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