[jira] [Commented] (SPARK-13771) Eliminate child of project if the project with no references to its child

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

    [ https://issues.apache.org/jira/browse/SPARK-13771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186715#comment-15186715 ] 

Apache Spark commented on SPARK-13771:
--------------------------------------

User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/11602

> Eliminate child of project if the project with no references to its child
> -------------------------------------------------------------------------
>
>                 Key: SPARK-13771
>                 URL: https://issues.apache.org/jira/browse/SPARK-13771
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Liang-Chi Hsieh
>            Priority: Minor
>
> This is a corner case that a Project node can have no references to its child. E.g.,
> {code}
> val input = LocalRelation('key.int, 'value.string)
> Project(Literal(1).as("1") :: Nil, input)
> {code}
> We can actually replace the input with a dummy OneRowRelation.



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