evaluators.add(evaluator);
aggregators.add(aggregator);
}
else {
AggregationSpec spec = aggregateNode.getFactory().getSpec(false);
AggregationAccessor accessor = aggregateNode.getFactory().getAccessor();
Integer slot = streamSlots.get(spec.getStreamNum());
if (slot == null) {
streamSlots.put(spec.getStreamNum(), currentSlot);
slot = currentSlot++;