public boolean isNull(int row, int col) {
    if (nullBitMaps == null || nullBitMaps[col] == null) {
      return false;
    }
    return nullBitMaps[col].isMarked(row);
  }
This param record whether the source of logical view is aligned. Only used when there are
views.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/statement/crud/InsertTabletStatement.java