GitHub user gatorsmile opened a pull request:

    [SPARK-18674][SQL][Follow-Up] improve the error message of using join

    ### What changes were proposed in this pull request?
    Added a test case for using joins with nested fields. 
    ### How was this patch tested?

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

    $ git pull followup-18674

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

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

    This closes #16110
commit 70a2d446c1be31528fcb500eec16f609275788d8
Author: gatorsmile <>
Date:   2016-12-01T22:44:51Z

    added an example.

commit e754ef515b5e563e597674adce175b21830deaa3
Author: gatorsmile <>
Date:   2016-12-01T22:46:44Z

    added a message


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