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