[jira] [Commented] (SPARK-18048) If expression behaves differently if true and false expression are interchanged in case of different data types.

["Priyanka Garg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15594818#comment-15594818 ] 

Priyanka Garg commented on SPARK-18048:
---------------------------------------

I am working on it.

> 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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