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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12082) Null comparison for greatest and least operator
Date Fri, 09 Oct 2015 21:32:05 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951231#comment-14951231
] 

Sergey Shelukhin commented on HIVE-12082:
-----------------------------------------

Does ANSI SQL specify how this should behave?

> Null comparison for greatest and least operator
> -----------------------------------------------
>
>                 Key: HIVE-12082
>                 URL: https://issues.apache.org/jira/browse/HIVE-12082
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>            Reporter: Szehon Ho
>
> In mysql comparisons if any of the entries are null, then the result is null.
> [https://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html|https://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html]
and [https://dev.mysql.com/doc/refman/5.0/en/type-conversion.html|https://dev.mysql.com/doc/refman/5.0/en/type-conversion.html].
> This can be demonstrated by the following mysql query:
> {noformat}
> mysql> select greatest(1, null) from test;
> +-------------------+
> | greatest(1, null) |
> +-------------------+
> |              NULL |
> +-------------------+
> 1 row in set (0.00 sec)
> mysql> select greatest(-1, null) from test;
> +--------------------+
> | greatest(-1, null) |
> +--------------------+
> |               NULL |
> +--------------------+
> 1 row in set (0.00 sec)
> {noformat}
> This is in contrast to Hive, where null does not win in greatest, least over values.



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