================================================================================
basic
================================================================================
do $$ begin execute 'command'; end $$;
--------------------------------------------------------------------------------

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

================================================================================
into
================================================================================
do $$ begin execute 'command' into var; end $$;
--------------------------------------------------------------------------------

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

================================================================================
into strict
================================================================================
do $$ begin execute 'command' into strict var; end $$;
--------------------------------------------------------------------------------

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

================================================================================
using
================================================================================
do $$ begin execute 'command' using 1, foo(bar); end $$;
--------------------------------------------------------------------------------

(source_file
  (do_block
    (block
      (dollar_quote)
      (body
        (execute_statement
          (string)
          (number)
          (function_call
            (identifier)
            (identifier))))
      (dollar_quote))))

================================================================================
function call
================================================================================
do $$ begin execute foo() into strict var using 1; end $$;
--------------------------------------------------------------------------------

(source_file
  (do_block
    (block
      (dollar_quote)
      (body
        (execute_statement
          (function_call
            (identifier))
          (into
            (identifier))
          (number)))
      (dollar_quote))))

================================================================================
string concatenation
================================================================================
do $$ begin execute 'foo' || 'bar' into _date; end $$;
--------------------------------------------------------------------------------

(source_file
  (do_block
    (block
      (dollar_quote)
      (body
        (execute_statement
          (op_expression
            (string)
            (other_op)
            (string))
          (into
            (identifier))))
      (dollar_quote))))