public int getLastRowIndex(int externalIndex, int internalIndex) {
    int index = internalRowListCapacity * externalIndex;
    int offset = internalRowList.get(externalIndex).getLastRowIndex(internalIndex);

    return index + offset;
  }
true if any field except the timestamp in the current row is null.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/transformation/datastructure/row/ElasticSerializableRowList.java