GitHub user goldmedal opened a pull request:

    [SPARK-21629][SQL][WIP] Fix Or nullability

    ## What changes were proposed in this pull request?
    Override nullable of Or Expression to make sure nullable behavior is 
    ## How was this patch tested?
    I'll add test case later
    cc @viirya 

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    This closes #18854
commit be711d003f2831c1ab4b69fc2a119aefbba08743
Author: goldmedal <>
Date:   2017-08-05T14:44:04Z

    Fix Or nullability


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