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The range aggregation counts the number of occurrences over user-defined buckets. The buckets must be continuous and cannot overlap. 
SELECT pdb.agg('{"range": {"field": "rating", "ranges": [{"to": 3.0 }, {"from": 3.0, "to": 6.0} ]}}')
FROM mock_items
WHERE id @@@ pdb.all();
Expected Response
                                                                              agg
----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"buckets": [{"to": 3.0, "key": "*-3", "doc_count": 4}, {"to": 6.0, "key": "3-6", "from": 3.0, "doc_count": 37}, {"key": "6-*", "from": 6.0, "doc_count": 0}]}
(1 row)
See the Tantivy documentation for all available options.