GitHub user viirya opened a pull request:

    https://github.com/apache/spark/pull/21065

    [SPARK-23979][SQL] MultiAlias should not be a CodegenFallback

    ## What changes were proposed in this pull request?
    
    Just found `MultiAlias` is a `CodegenFallback`. It should not be as looks 
like `MultiAlias` won't be evaluated.
    
    ## How was this patch tested?
    
    Existing tests.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/viirya/spark-1 
multialias-without-codegenfallback

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/21065.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #21065
    
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commit 05a57cbeaba9294ba55c4cc1bf9b782b86eb8770
Author: Liang-Chi Hsieh <viirya@...>
Date:   2018-04-13T13:00:21Z

    MultiAlias should not be a CodegenFallback.

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