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From "Priyanka Garg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-18048) If expression behaves differently if true and false expression are interchanged in case of different data types.
Date Fri, 21 Oct 2016 11:12:58 GMT
Priyanka Garg created SPARK-18048:
-------------------------------------

             Summary: If expression behaves differently if true and false expression are interchanged
in case of different data types.
                 Key: SPARK-18048
                 URL: https://issues.apache.org/jira/browse/SPARK-18048
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Priyanka Garg


If expression behaves differently if true and false expression are interchanged in case of
different data types.

For eg. 
If(Literal.create(geo != null, BooleanType),
        Literal.create(null, DateType),
        Literal.create(null, TimestampType)) is throwing error while 

If(Literal.create(geo != null, BooleanType),
        Literal.create(null, TimestampType),
        Literal.create(null, DateType )) works fine.

The reason for the same is that the If expression 's datatype only considers trueValue.dataType.

Also, 
If(Literal.create(geo != null, BooleanType),
        Literal.create(null, DateType),
        Literal.create(null, TimestampType))
 is breaking only in case of Generated mutable Projection and Unsafe projection. For all other
types its working fine.



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