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Posted to issues@spark.apache.org by "Hyukjin Kwon (Jira)" <ji...@apache.org> on 2023/02/13 06:58:00 UTC

[jira] [Commented] (SPARK-42227) Use approx_percentile function running slower in spark3 than spark2

    [ https://issues.apache.org/jira/browse/SPARK-42227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17687765#comment-17687765 ] 

Hyukjin Kwon commented on SPARK-42227:
--------------------------------------

How much fast is it?

> Use approx_percentile function running slower in spark3 than spark2
> -------------------------------------------------------------------
>
>                 Key: SPARK-42227
>                 URL: https://issues.apache.org/jira/browse/SPARK-42227
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.2.1
>            Reporter: xuanzhiang
>            Priority: Major
>
> approx_percentile(end_ts-start_ts,0.9) cost_p90
> in spark3 , it use objectHashAggregate method , but it shuffle very slow. when i use percentile , it become fast. i dont know the reson, i think approx_percentile should fast.



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