docs: private void mergerByScore(Term fromTerm, int to, boolean asc) {
  		Term term = null;
  		if (terms[to] != null) {
  			term = terms[to];
  			while (term != null) {
  				// 关系式to.set(from)
  				term.setPathSelfScore(fromTerm, asc);
  				term = term.next();
  			}
  		}
  
  	}