user: Question: Who is listed under mens singles when the year location is 2009 Doha?
Columns: ['Year Location', 'Mens Singles', 'Womens Singles', 'Mens Doubles', 'Womens Doubles']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2012 Doha', 'Xu Xin', 'Chen Meng', 'Ma Lin Xu Xin', 'Li Xiaodan Wen Jia']
SQL:

assistant: SELECT "Mens Singles" FROM "Table" WHERE "Year Location" = '2009 Doha';