[jira] [Commented] (SPARK-41171) Push down filter through window when partitionSpec is empty

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-41171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692628#comment-17692628 ] 

Apache Spark commented on SPARK-41171:
--------------------------------------

User 'beliefer' has created a pull request for this issue:
https://github.com/apache/spark/pull/40142

> Push down filter through window when partitionSpec is empty
> -----------------------------------------------------------
>
>                 Key: SPARK-41171
>                 URL: https://issues.apache.org/jira/browse/SPARK-41171
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: jiaan.geng
>            Priority: Major
>
> Sometimes, filter compares the rank-like window functions with number.
> {code:java}
> SELECT *, ROW_NUMBER() OVER(ORDER BY a) AS rn FROM Tab1 WHERE rn <= 5
> {code}
> We can create a Limit(5) and push down it as the child of Window.
> {code:java}
> SELECT *, ROW_NUMBER() OVER(ORDER BY a) AS rn FROM (SELECT * FROM Tab1 ORDER BY a LIMIT 5) t
> {code}



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