benchmark() работает совсем некорректно about postgresql-patterns-library

[rin-nas]

https://github.com/2ndQuadrant/mysqlcompat/blob/master/sql_bits/information.sql

-- BENCHMARK()
-- Note: This version requires the expression to be quoted.
-- Note: To show query times in psql, run \timing first
-- Example: SELECT BENCHMARK(100000, $$ length('hello') $$);
CREATE OR REPLACE FUNCTION benchmark(integer, text)
RETURNS integer AS $$
  BEGIN
    FOR i IN 1..$1 LOOP
      EXECUTE 'SELECT ' || $2;
    END LOOP;
    RETURN 0;
  END;
$$ STRICT LANGUAGE PLPGSQL;