@Override
      public boolean hasNext() {
        if (next == null) {
          tryGetNext();
        }
        return next != null;
      }
Get node by the path

@return last node in given seriesPath
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/mem/MTreeBelowSGMemoryImpl.java