docs: public static NodeSequence emptySequence( final int width ) {
          assert width >= 0;
          return new NodeSequence() {
              @Override
              public int width() {
                  return width;
              }
  
              @Override
              public Batch nextBatch() {
                  return null;
              }
  
              @Override
              public long getRowCount() {
                  return 0;
              }
  
              @Override
              public boolean isEmpty() {
                  return true;
              }
  
              @Override
              public void close() {
              }
  
              @Override
              public String toString() {
                  return "(empty-sequence width=" + width() + ")";
              }
          };
      }