union all has a problem if no embedding select is present
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Key: HIVE-92
URL: https://issues.apache.org/jira/browse/HIVE-92
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Reporter: Namit Jain
Assignee: Namit Jain
select s2.key as key, s2.value as value from src s2
UNION ALL
select s1.key as key, s1.value as value from src s1;
does not work.
The code assumes that either it is a join or only one source is present
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