@TestOnly
  public boolean fieldsHasAnyNull(int index) throws IOException {
    Object[] row =
        internalRowList
            .get(index / internalRowListCapacity)
            .getRow(index % internalRowListCapacity);
    for (Object field : row) {
      if (field == null) {
        return true;
      }
    }

    return false;
  }
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