Schema computeAvroSchema() {
   List<Schema.Field> fields = new ArrayList<Schema.Field>();
   for (InferredType it : structTypes) {
     Schema itS = it.getAvroSchema();
     if (itS == null) {
       continue;
     }
     fields.add(
         new Schema.Field(
             it.getName(), it.getAvroSchema(), it.getDocString(), it.getDefaultValue()));
   }
   Schema s = Schema.createRecord(name, "RECORD", "", false);
   s.setFields(fields);
   return s;
 }