================================================================================
body block
================================================================================
CREATE FUNCTION FOO () RETURNS void AS $$ BEGIN END $$ LANGUAGE sql;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (block
      (dollar_quote)
      (body)
      (dollar_quote))
    (identifier)))

================================================================================
or replace
================================================================================
CREATE OR REPLACE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (or_replace)
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)))

================================================================================
immutable
================================================================================
CREATE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql IMMUTABLE;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)
    (function_volatility)))

================================================================================
stable
================================================================================
CREATE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql STABLE;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)
    (function_volatility)))

================================================================================
volatile
================================================================================
CREATE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql VOLATILE;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)
    (function_volatility)))

================================================================================
returns setof
================================================================================
CREATE FUNCTION FOO () RETURNS SETOF text AS 'select' LANGUAGE sql;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (return_setof
        (identifier)))
    (string)
    (identifier)))

================================================================================
returns table
================================================================================
CREATE FUNCTION FOO () RETURNS TABLE(a text, b bigint) AS 'select' LANGUAGE sql;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (return_table
        (var_declaration
          (identifier)
          (identifier))
        (var_declaration
          (identifier)
          (identifier))))
    (string)
    (identifier)))

================================================================================
security definer
================================================================================
CREATE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql SECURITY definer;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)
    (function_run_as)))

================================================================================
security invoker
================================================================================
CREATE FUNCTION FOO () RETURNS void AS 'select' LANGUAGE sql SECURITY INVOKER;
--------------------------------------------------------------------------------

(source_file
  (create_function_statement
    (function_signature
      (identifier)
      (function_parameters))
    (function_return
      (identifier))
    (string)
    (identifier)
    (function_run_as)))