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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/02/01 06:03:00 UTC

[jira] [Commented] (SPARK-34307) TakeOrderedAndProjectExec avoid shuffle if input rdd has single partition

    [ https://issues.apache.org/jira/browse/SPARK-34307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276071#comment-17276071 ] 

Apache Spark commented on SPARK-34307:
--------------------------------------

User 'zhengruifeng' has created a pull request for this issue:
https://github.com/apache/spark/pull/31409

> TakeOrderedAndProjectExec avoid shuffle if input rdd has single partition
> -------------------------------------------------------------------------
>
>                 Key: SPARK-34307
>                 URL: https://issues.apache.org/jira/browse/SPARK-34307
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: zhengruifeng
>            Priority: Minor
>
> existing impl collects local topKs to a final partition by a ShuffleExchangeExec,
> when the input is small and has only one partition, this shuffle can be skipped.



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