public void appendValue(final V value, final BiConsumer<V, Set<V>> remappingFunction) {
    remappingFunction.accept(value, valueSet);
  }
Used only in PatternTreeMap to identify whether from root to the current node is a registered
path pattern. In PatternTreeMap, it can be replaced by the size of the valueSet
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/path/PathPatternNode.java