Steven Jacobs created ASTERIXDB-2404:
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             Summary: AbstractGroupingProperty mishandles empty heads for 
functional dependencies
                 Key: ASTERIXDB-2404
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2404
             Project: Apache AsterixDB
          Issue Type: Improvement
            Reporter: Steven Jacobs


If a group by uses variable $VAR, and there is a functional dependency of the 
form:

[] -> $VAR

reduceGroupingColumns() will eliminate $VAR from the group by.



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