================================================================================
open for select
================================================================================
DO $$
BEGIN
    OPEN curs for select 2;
END
$$;
--------------------------------------------------------------------------------

(source_file
  (do_block
    (block
      (dollar_quote)
      (body
        (open_cursor_statement
          (identifier)
          (select_statement
            (select_item
              (number)))))
      (dollar_quote))))

================================================================================
open for execute
================================================================================
DO $$
BEGIN
    open foo for execute('select 1');
END
$$;
--------------------------------------------------------------------------------

(source_file
  (do_block
    (block
      (dollar_quote)
      (body
        (open_cursor_statement
          (identifier)
          (execute_statement
            (string))))
      (dollar_quote))))