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https://issues.apache.org/jira/browse/HIVE-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697074#action_12697074
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Johan Oskarsson commented on HIVE-384:
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I created HIVE-397 to track the test fixing
> 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
> Fix For: 0.3.0, 0.4.0
>
> Attachments: hive.384.1.patch, hive.384.2.patch, hive.384.3.patch,
> hive.384.4.patch, hive.384.5.patch, hive.384.6.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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