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


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:
>             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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