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https://issues.apache.org/jira/browse/SPARK-34257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17272660#comment-17272660
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Apache Spark commented on SPARK-34257:
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User 'beliefer' has created a pull request for this issue:
https://github.com/apache/spark/pull/31356
> Improve performance for last_value over unbounded window frame
> --------------------------------------------------------------
>
> Key: SPARK-34257
> URL: https://issues.apache.org/jira/browse/SPARK-34257
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: jiaan.geng
> Priority: Major
>
> The current implement of `last_value` will execute `updateExpressions`
> multiple times.
> In fact, `last_value` only execute `updateExpressions` once on the last row.
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