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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-384) problem in union if the first subquery is a map-only job
Date Mon, 06 Apr 2009 21:05:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696248#action_12696248
] 

Namit Jain commented on HIVE-384:
---------------------------------

that is because of map-side aggregation

> problem in union if the first subquery is a map-only job
> --------------------------------------------------------
>
>                 Key: HIVE-384
>                 URL: https://issues.apache.org/jira/browse/HIVE-384
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>            Priority: Blocker
>         Attachments: hive.384.1.patch, hive.384.2.patch, hive.384.3.patch, hive.384.4.patch
>
>
> Union needs special handling.
> explain 
>   select unionsrc.key, count(1) FROM (select s2.key as key, s2.value as value from src1
s2
>                                         UNION  ALL  
>                                       select 'tst1' as key, cast(count(1) as string)
as value from src s1) 
>   unionsrc group by unionsrc.key;
> results in a null pointer exception

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