List getGroupJunctionList() {
    // return unmodifiable copy
    return groupJunctions != null ? Collections.unmodifiableList(groupJunctions) : null;
  }
@return List containg GroupJunctions which are part of this CompositeGroupJunction. It can be
        null if there does not exist any filter evaluatable condition belonging solely to an
        independent region or its group of iterators, constituting the CompositeGroupJunction,
        so that no GroupJunctions get assosciated with the CompositeGroupJunction
geode-core/src/main/java/org/apache/geode/cache/query/internal/CompositeGroupJunction.java