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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-24193) Sort by disk when number of limit is big in TakeOrderedAndProjectExec
Date Thu, 17 May 2018 14:31:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wenchen Fan reassigned SPARK-24193:
-----------------------------------

    Assignee: jin xing

> Sort by disk when number of limit is big in TakeOrderedAndProjectExec
> ---------------------------------------------------------------------
>
>                 Key: SPARK-24193
>                 URL: https://issues.apache.org/jira/browse/SPARK-24193
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: jin xing
>            Assignee: jin xing
>            Priority: Major
>             Fix For: 2.4.0
>
>
> Physical plan of  "_select colA from t order by colB limit M_" is _TakeOrderedAndProject_;
> Currently _TakeOrderedAndProject_ sorts data in memory, see https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala#L158

> Shall we add a config -- if the number of limit (M) is too big, we can sort by disk ?
Thus memory issue can be resolved.



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