text: CREATE EXTENSION pg_strsearch;
  
  CREATE TABLE pg_strsearch_rg (
  	col1	VARCHAR(128),
  	col2	VARCHAR(128),
  	col3	VARCHAR(128)
  );
  
  INSERT INTO pg_strsearch_rg VALUES('test1', NULL, 'dummy');
  INSERT INTO pg_strsearch_rg VALUES('test1', 'test2', 'dummy');
  INSERT INTO pg_strsearch_rg VALUES('test1', 'test2', 'test3');
  
  SELECT pg_strsearch('test');
  
  DROP TABLE pg_strsearch_rg;
  DROP EXTENSION pg_strsearch;
  