How many people are shown for mens doubles when guo yue played womens singles?
CREATE TABLE "japan_open" (
  "year_location" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text
);
SELECT COUNT("mens_doubles") FROM "japan_open" WHERE "womens_singles"='Guo Yue';