[jira] [Commented] (SPARK-7267) Push down Project when it's child is Limit

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

    [ https://issues.apache.org/jira/browse/SPARK-7267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14583041#comment-14583041 ] 

Apache Spark commented on SPARK-7267:
-------------------------------------

User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/6780

> Push down Project when it's child is Limit 
> -------------------------------------------
>
>                 Key: SPARK-7267
>                 URL: https://issues.apache.org/jira/browse/SPARK-7267
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.3.1
>            Reporter: Zhongshuai Pei
>            Assignee: Zhongshuai Pei
>            Priority: Critical
>             Fix For: 1.4.0
>
>
> SQL
> {quote}
> select key from (select key,value from t1 limit 100) t2 limit 10
> {quote}
> Optimized Logical Plan before modifying
> {quote}
> == Optimized Logical Plan ==
> Limit 10
>  Project [key#228]
>   Limit 100
>    MetastoreRelation default, t1, None
> {quote}
> Optimized Logical Plan after modifying
> {quote}
> == Optimized Logical Plan ==
> Limit 10
>  Limit 100
>    Project [key#228]
>     MetastoreRelation default, t1, None
> {quote}
> After this, we can  combine limits



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