Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_28138035_20 ( year_location VARCHAR, mens_doubles VARCHAR )

### Question ###
How many years did lin gaoyuan wu jiaji play mens doubles?

### Accurate SQL ###

SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji"