GitHub user aokolnychyi opened a pull request:

    https://github.com/apache/spark/pull/18909

    [MINOR][SQL] Additional test case for CheckCartesianProducts rule

    ## What changes were proposed in this pull request?
    
    While discovering optimization rules and their test coverage, I did not 
find any tests for `CheckCartesianProducts` in the Catalyst folder. So, I 
decided to create a new test suite. Once I finished, I found a test in 
`JoinSuite` for this functionality so feel free to discard this change if it 
does not make much sense. The proposed test suite covers a few additional use 
cases.
    


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

    $ git pull https://github.com/aokolnychyi/spark check-cartesian-join-tests

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

    https://github.com/apache/spark/pull/18909.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 #18909
    
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commit 98b54cad45b638515d36966a1e64955f4f1531d1
Author: aokolnychyi <anton.okolnyc...@sap.com>
Date:   2017-08-09T21:13:02Z

    [MINOR][SQL] Additional test case for CheckCartesianProducts rule

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