Allow ARRAY_CONTAINS to be used as join key
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                 Key: HIVE-1919
                 URL: https://issues.apache.org/jira/browse/HIVE-1919
             Project: Hive
          Issue Type: Improvement
            Reporter: Adam Kramer


Using ARRAY_CONTAINS(b.haystack, a.needle) fails with the "Both Left and Right 
Aliases Encountered in Join" error. But, it doesn't have to...it is effectively 
an equi-join, just more complicated. The appropriate functionality can be 
attained using EXPLODE and GROUP BY, but that is ridiculous in terms of amount 
of work generated for the cluster.

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