--
-- Argument and column names, including ones that are not valid Ruby
-- local-variable names (accessible only positionally through args).
--
-- A capitalized argument name is not a valid Ruby local; the positional
-- args array still works.
CREATE FUNCTION cap_arg("Value" int) RETURNS int LANGUAGE plruby AS $$
    args[0] + 1
$$;
SELECT cap_arg(41);
 cap_arg 
---------
      42
(1 row)

-- Numeric-looking column names in a composite result.
CREATE TYPE nums AS ("1" int, "2" int);
CREATE FUNCTION make_nums() RETURNS nums LANGUAGE plruby AS $$
    {'1' => 10, '2' => 20}
$$;
SELECT * FROM make_nums();
 1  | 2  
----+----
 10 | 20
(1 row)

-- Underscored and valid names are aliased as locals.
CREATE FUNCTION valid_names(first_name text, last_name text) RETURNS text
LANGUAGE plruby AS $$
    "#{first_name} #{last_name}"
$$;
SELECT valid_names('Grace', 'Hopper');
 valid_names  
--------------
 Grace Hopper
(1 row)