Who are all directors when Sherwood Schwartz is the writer?
CREATE TABLE "table1_2342078_2" (
  "episode_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_airdate" text,
  "production_code_order_they_were_made_num" real
);
SELECT "directed_by" FROM "table1_2342078_2" WHERE "written_by"='Sherwood Schwartz';