docs: public static void createSegmentMemory(LeftTupleSource tupleSource, InternalWorkingMemory wm) {
          Memory mem = wm.getNodeMemory((MemoryFactory) tupleSource);
          SegmentMemory smem = mem.getSegmentMemory();
          if ( smem == null ) {
              createSegmentMemory(tupleSource, mem, wm);
          }
      }