who is the the voice actor (japanese) with character name being goku
CREATE TABLE "cast" (
  "character_name" text,
  "voice_actor_japanese" text,
  "voice_actor_english_1997_saban" text,
  "voice_actor_english_1998_pioneer" text,
  "voice_actor_english_2006_fu_nimation" text
);
SELECT "voice_actor_japanese" FROM "cast" WHERE "character_name"='Goku';