[jira] [Commented] (HIVE-3183) case expression should allow different types per ISO-SQL 2011

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-3183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787714#comment-13787714 ] 

Ashutosh Chauhan commented on HIVE-3183:
----------------------------------------

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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