When koki mizuno is the player how man positions are there?
{'header': ['P', 'Player', 'Position', 'SPL', 'League Cup', 'Scottish Cup', 'UEFA Champions League', 'Total'], 'page_title': '2008–09 Celtic F.C. season', 'page_id': '', 'types': ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real'], 'id': '1-18254488-2', 'section_title': 'Top scorers', 'caption': 'Top scorers', 'rows': [['1', 'Scott McDonald', 'Forward', '16', '1', '1', '1', '19'], ['2', 'Georgios Samaras', 'Forward', '15', '2', '0', '0', '17'], ['3', 'Shunsuke Nakamura', 'Midfielder', '8', '1', '0', '0', '9'], ['4', 'Scott Brown', 'Midfielder', '5', '1', '1', '0', '7'], ['4', 'Aiden McGeady', 'Midfielder', '3', '2', '1', '1', '7'], ['5', 'Jan Vennegoor of Hesselink', 'Forward', '6', '0', '0', '0', '6'], ['6', 'Shaun Maloney', 'Midfielder', '4', '0', '0', '1', '5'], ['7', 'Cillian Sheridan', 'Forward', '4', '0', '0', '0', '4'], ['7', 'Stephen McManus', 'Defender', '4', '0', '0', '0', '4'], ['7', 'Glenn Loovens', 'Defender', '3', '1', '0', '0', '4'], ['8', 'Paul Hartley', 'Midfielder', '3', '0', '0', '0', '3'], ['8', 'Gary Caldwell', 'Defender', '2', '0', '1', '0', '3'], ['9', 'Barry Robson', 'Midfielder', '1', '0', '0', '1', '2'], ['9', "Darren O'Dea", 'Defender', '1', '1', '0', '0', '2'], ['10', 'Koki Mizuno', 'Defender', '1', '0', '0', '0', '1'], ['10', 'Marc Crosas', 'Defender', '1', '0', '0', '0', '1']], 'name': 'table_18254488_2'}