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https://issues.apache.org/jira/browse/HIVE-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733016#action_12733016
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Min Zhou commented on HIVE-512:
-------------------------------
select(1, '2', 3)
select(2, '2', 3)
select(1, true, 3)
select(2, 2.0, cast(3 as double))
if we don't uniformly return strings, it would be confused to user detemining
which type will return.
> [GenericUDF] new string function ELT(N,str1,str2,str3,...)
> -----------------------------------------------------------
>
> Key: HIVE-512
> URL: https://issues.apache.org/jira/browse/HIVE-512
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Affects Versions: 0.4.0
> Reporter: Min Zhou
> Assignee: Min Zhou
> Fix For: 0.4.0
>
> Attachments: HIVE-512.2.patch, HIVE-512.patch
>
>
> ELT(N,str1,str2,str3,...)
> Returns str1 if N = 1, str2 if N = 2, and so on. Returns NULL if N is less
> than 1 or greater than the number of arguments. ELT() is the complement of
> FIELD().
> {noformat}
> mysql> SELECT ELT(1, 'ej', 'Heja', 'hej', 'foo');
> -> 'ej'
> mysql> SELECT ELT(4, 'ej', 'Heja', 'hej', 'foo');
> -> 'foo'
> {noformat}
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