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From "Davies Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-12385) Push projection into Join
Date Tue, 29 Dec 2015 22:45:49 GMT

    [ https://issues.apache.org/jira/browse/SPARK-12385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15074383#comment-15074383
] 

Davies Liu commented on SPARK-12385:
------------------------------------

[~smilegator] Thanks for working on this, could you take the Aggregation as an example, Join
could have a optional resultExpression (which does not equal to left.output ++ right.output),
then expressions of Projection could be pushed into it.

> Push projection into Join
> -------------------------
>
>                 Key: SPARK-12385
>                 URL: https://issues.apache.org/jira/browse/SPARK-12385
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Davies Liu
>
> We usually have  Join followed by a projection to pruning some columns, but Join already
have a result projection to produce UnsafeRow, we should combine them together.



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