title: Python Apache Beam convert list of dicts to multiple PCollection elements
body: <p>As part of my dataflow I have a <code>CombineFn</code> that returns a list of dicts. I want to print each dict to an avro file as a record. However, when I apply <code>beam.io.WriteToAvro</code> to my <code>CombineFn</code> output, it fails. </p>
  
  <p>It seems like the full list of dicts is being treated as a single element. Is there any way I can get it to treat it like a list of elements? </p>