in saga-core-akka/src/main/java/org/apache/servicecomb/saga/core/actors/RequestActor.java [175:179]
private boolean isChosenChild(List<SagaResponse> parentResponses) {
return request.parents().length == 0 || parentResponses.isEmpty() || parentResponses.stream()
.map(context::chosenChildren)
.anyMatch(chosenChildren -> chosenChildren.isEmpty() || chosenChildren.contains(request.id()));
}