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https://issues.apache.org/jira/browse/SPARK-32947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang updated SPARK-32947:
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Target Version/s: (was: 3.0.1)
> Support top-N sort for Spark SQL window function
> ------------------------------------------------
>
> Key: SPARK-32947
> URL: https://issues.apache.org/jira/browse/SPARK-32947
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.1
> Reporter: Zikun
> Priority: Major
>
> In Spark SQL, there are two types of sort execution, *_SortExec_* and
> *_TakeOrderedAndProjectExec_* . *_SortExec_* is a general sorting execution
> and it does not support top-N sort. *_TakeOrderedAndProjectExec_* is the
> execution for top-N sort in Spark. Spark SQL rank window function needs to
> sort the data locally and it relies on the execution plan *_SortExec_* to
> sort the data in each physical data partition. When the filter of the window
> rank (e.g. rank <= 100) is specified in a user's query, the filter can
> actually be pushed down to the SortExec and then we let SortExec operates
> top-N sort. Right now SortExec does not support top-N sort and we need to
> extend the capability of SortExec to support top-N sort.
>
> This Jira has dependency on another existing Jira
> https://issues.apache.org/jira/browse/SPARK-32096
>
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