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https://issues.apache.org/jira/browse/SPARK-18048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15653331#comment-15653331
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Wenchen Fan commented on SPARK-18048:
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according to the discussion in the PR, this ticket is invalid, I'm clsoing 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.
> 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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