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From "S. Alex Smith (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-459) Allow limited 'OR' in join clauses
Date Wed, 29 Apr 2009 23:19:30 GMT
Allow limited 'OR' in join clauses
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                 Key: HIVE-459
                 URL: https://issues.apache.org/jira/browse/HIVE-459
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: S. Alex Smith
            Priority: Minor


A (somewhat) common use case for full outer joins is

FROM a
FULL OUTER JOIN b ON (b.foo = a.foo)
FULL OUTER JOIN c ON (c.foo = a.foo OR c.foo = b.foo)

It would be nice if this (or equivalent functionality) could be supported by hive.  Note that
this is a specific use of OR that would allow rows from all three tables to be clustered on
the same key.

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