public boolean hasWindowOrJoins() {
    return hasWindowOrJoins;
  }
Returns <tt>true</tt> iff this {@link StreamApplicationDescriptorImpl} contains a join or a window operator

@return  <tt>true</tt> iff this {@link StreamApplicationDescriptorImpl} contains a join or a window operator
samza-core/src/main/java/org/apache/samza/operators/OperatorSpecGraph.java