text: CREATE TABLE synonyms (
    term text PRIMARY KEY,
    synonyms text[]
  );
  
  CREATE INDEX synonyms_term_index ON synonyms
    USING pgroonga (term pgroonga.text_term_search_ops_v2);
  
  INSERT INTO synonyms VALUES ('Groonga', ARRAY['Groonga', 'Senna']);
  INSERT INTO synonyms VALUES ('GROONGA', ARRAY['"Full text search"']);
  
  SELECT pgroonga.query_expand('synonyms', 'term', 'synonyms', 'groonga');
  
  DROP TABLE synonyms;
  