title: SQLAlchemy how to call stored func in batch
body: <p>I need to call a stored function hundreds of time in a row,
  doing it in a single roundtrip to the DB would be a huge improvement,
  here is what I'd like to do in pseudo code : </p>
  
  <pre><code>args_for_multiple_calls = [
    {"a1": 1, "a2": "dfg4"),
    {"a1": 4, "a2": "ger"),
    {"a1": 2, "a2": "sfg3"),
  ]
  
  connection.executemany("select my_stored_func(:a1, :a2)")
  </code></pre>
  
  <p>Does SQLAlchemy support this ?</p>