user: Question: How many players are there for mens singles when Chen Qi Ma Lin played mens doubles?
Columns: ['Year Location', 'Mens Singles', 'Womens Singles', 'Mens Doubles', 'Womens Doubles']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2012 Kobe', 'Jun Mizutani', 'Shen Yanfei', 'Kim Min-Seok Seo Hyun-Deok', 'Hiroko Fujii Misako Wakamiya']
SQL:

assistant: SELECT COUNT("Mens Singles") FROM "Table" WHERE "Mens Doubles" = 'Chen Qi Ma Lin';