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Posted to issues@spark.apache.org by "jiaan.geng (Jira)" <ji...@apache.org> on 2021/05/08 06:02:00 UTC
[jira] [Resolved] (SPARK-34274) Improve performance for last_value
over unbounded preceding window frame
[ https://issues.apache.org/jira/browse/SPARK-34274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
jiaan.geng resolved SPARK-34274.
--------------------------------
Resolution: Later
> Improve performance for last_value over unbounded preceding window frame
> ------------------------------------------------------------------------
>
> Key: SPARK-34274
> URL: https://issues.apache.org/jira/browse/SPARK-34274
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: jiaan.geng
> Priority: Major
>
> The current implement of `last_value` over unbounded preceding window frame will execute `updateExpressions` multiple times.
> In fact, `last_value` only execute `updateExpressions` once on the last row.
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