text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_28138035_20 (year_location VARCHAR, mens_doubles VARCHAR)
  ### Question:
  How many years did lin gaoyuan wu jiaji play  mens doubles?
  ### Answer:
  SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji"