GitHub user priyankagargnitk opened a pull request:

    https://github.com/apache/spark/pull/15479

    [SPARK-17884][SQL] To resolve Null pointer exception when casting from  
empty string to interval type

    ## What changes were proposed in this pull request?
    This change adds a check in castToInterval method of Cast expression , such 
that if converted value is null , then isNull variable should be set to true.
    
    Earlier, the expression Cast(Literal(), CalendarIntervalType) was throwing 
NullPointerException because of the above mentioned reason.
    
    ## How was this patch tested?
    Added test case in CastSuite.scala
    
    jira entry for detail: https://issues.apache.org/jira/browse/SPARK-17884

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

    $ git pull https://github.com/priyankagargnitk/spark cast_empty_string_bug

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

    https://github.com/apache/spark/pull/15479.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 #15479
    
----
commit 6bdbe7d31f7b01727858fe10593b35ac1b2dafad
Author: prigarg <prig...@adobe.com>
Date:   2016-10-12T17:14:45Z

    [SPARK-17884][SQL] To resolve Null pointer exception when casting from 
empty string to interval type.
    
    ## What changes were proposed in this pull request?
    This change adds a check in castToInterval method of Cast expression , such 
that if converted value is null , then isNull variable should be set to true.
    
    Earlier, the expression Cast(Literal(), CalendarIntervalType) was throwing 
NullPointerException because of the above mentioned reason.
    
    ## How was this patch tested?
    Added test case in CastSuite.scala
    
    jira entry for detail: https://issues.apache.org/jira/browse/SPARK-17884
    
    Author: prigarg <prig...@adobe.com>
    
    Closes #15449 from priyankagargnitk/SPARK-17884.

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