Question: who played barney hefner on all in the family
[{'answer': 'Allan John Melvin', 'provenance': [{'wikipedia_id': '1917062', 'title': 'Allan Melvin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1917062', 'title': 'Allan Melvin', 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 565, 'bleu_score': 0.635926589091388, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11578415215317185330}, 'section': 'Section::::Abstract.'}]}]