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https://issues.apache.org/jira/browse/HIVE-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696305#action_12696305
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Namit Jain commented on HIVE-384:
---------------------------------
Zheng pointed out another unrelated bug in the code for explain. The kids of
reduce sink was not made null for all dependent tasks, so only explain plans
of top level tasks were correct.
Although, the reduce sink operator would ignore the kids, so there is no
runtime bug
> 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, hive.384.5.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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