Andy Seaborne created JENA-1507:

             Summary: GROUP BY and aggregates when there are no matching of the 
WHERE pattern.
                 Key: JENA-1507
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 3.6.0
            Reporter: Andy Seaborne
            Assignee: Andy Seaborne

There are two bugs in ARQs handling of grouping when there are no results in 
the WHERE clause.

When there is a GROUP BY, the outcome should be no rows. 
 * JENA-1487
 * [users list 

When there is no GROUP BY, no aggregates, and no pattern match, the result 
should be one row of no columns; when there is no GROUP BY, the result is 
always one row.  It returns zero rows (v3.6.0 and before).

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