text: -- We can't replace the fetchval function without dropping -> operator
  DROP OPERATOR -> (bigistore, integer);
  DROP FUNCTION IF EXISTS fetchval(bigistore, integer);
  CREATE OR REPLACE FUNCTION fetchval(bigistore, integer)
   RETURNS bigint
   LANGUAGE c
   IMMUTABLE STRICT
  AS 'istore', $function$bigistore_fetchval$function$;
  CREATE OPERATOR -> (
      leftarg   = bigistore,
      rightarg  = integer,
      procedure = fetchval
  );
  