Jesus Camacho Rodriguez created CALCITE-600:
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             Summary: Create UnionFactory and use in rules containing Union 
operator
                 Key: CALCITE-600
                 URL: https://issues.apache.org/jira/browse/CALCITE-600
             Project: Calcite
          Issue Type: Bug
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


Union related rules match on {{LogicalUnion}} and use this implementation to 
create the new Union operators. As it is done for other rules, a Union factory 
can be created and used by them, so subclasses that extend Union can use the 
rules.



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