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https://issues.apache.org/jira/browse/SPARK-34096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17263972#comment-17263972
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jiaan.geng commented on SPARK-34096:
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I'm working on.
> Improve performance for nth_value over unbounded preceding window frame
> -----------------------------------------------------------------------
>
> 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}
> UnboundedPrecedingOffsetWindowFunctionFrame
> {code}
> only support nth_value that respect nulls. So nth_value will execute
> {code:java}
> updateExpressions
> {code}
> multiple times.
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