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The stats aggregation returns the count, sum, min, max, and average all at once. 
SELECT pdb.agg('{"stats": {"field": "rating"}}') FROM mock_items
WHERE id @@@ pdb.all();
Expected Response
                                      agg
--------------------------------------------------------------------------------
 {"avg": 3.8536585365853657, "max": 5.0, "min": 1.0, "sum": 158.0, "count": 41}
(1 row)
See the Tantivy documentation for all available options.