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https://issues.apache.org/jira/browse/HIVE-3183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787714#comment-13787714
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Ashutosh Chauhan commented on HIVE-3183:
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Would you like to format this as a patch and submit for review?
> case expression should allow different types per ISO-SQL 2011
> -------------------------------------------------------------
>
> Key: HIVE-3183
> URL: https://issues.apache.org/jira/browse/HIVE-3183
> Project: Hive
> Issue Type: Bug
> Components: SQL
> Affects Versions: 0.8.0
> Reporter: N Campbell
> Attachments: Hive-3183.patch.txt, udf_when_type_wrong2.q.out,
> udf_when_type_wrong3.q.out
>
>
> The ISO-SQL standard specification for CASE allows the specification to
> include different types in the WHEN and ELSE blocks including this example
> which mixes smallint and integer types
> select case when vsint.csint is not null then vsint.csint else 1 end from
> cert.vsint vsint
> The Apache Hive docs do not state how it deviates from the standard or any
> given restrictions so unsure if this is a bug vs an enhancement. Many SQL
> applications mix so this seems to be a restrictive implementation if this is
> by design.
> Argument type mismatch '1': The expression after ELSE should have the same
> type as those after THEN: "smallint" is expected but "int" is found
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