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From "N Campbell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-3184) remove existing restriction that union must be defined within a derived table (follow ISO-SQL 2012)
Date Sun, 24 Jun 2012 12:21:42 GMT
N Campbell created HIVE-3184:
--------------------------------

             Summary: remove existing restriction that union must be defined within a derived
table (follow ISO-SQL 2012)
                 Key: HIVE-3184
                 URL: https://issues.apache.org/jira/browse/HIVE-3184
             Project: Hive
          Issue Type: Improvement
    Affects Versions: 0.8.0
            Reporter: N Campbell


Don't make SQL applications have to wrap the union operation within a derived table per the
SQL standard. Failing to do so results in Top level UNION is not supported currently; use
a subquery

i.e.

select c1, c2 from cert.tset1 tset1 union all select c1, c2 from cert.tset2 tset2


vs 

select * from ( select c1, c2 from cert.tset1 tset1 union all select c1, c2 from cert.tset2
tset2 ) T 

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