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

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-18048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan closed SPARK-18048.
-------------------------------
    Resolution: Invalid

> 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. 
>   checkEvaluation(
>       If(Literal.create(true, BooleanType),
>         Literal.create(identity(1), DateType),
>         Literal.create(identity(2L), TimestampType)),
>       identity(1)) is throwing error while 
>  checkEvaluation(
>       If(Literal.create(true, BooleanType),
>         Literal.create(identity(1L), TimestampType),
>         Literal.create(identity(2), DateType)),
>       identity(1L)) works fine.
> The reason for the same is that the If expression 's datatype only considers trueValue.dataType.
> Also, 
>   checkEvaluation(
>       If(Literal.create(true, BooleanType),
>         Literal.create(identity(1), DateType),
>         Literal.create(identity(2L), TimestampType)),
>       identity(1))
>  is breaking only in case of Generated mutable Projection and Unsafe projection. For all other types its working fine.
> Either both should work or none should work



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