@Override
      public void close() throws IOException {
        iterator.close();
      }
Adjusts the pipeline of incoming VRBs so that for each batch every row goes through the delete filter.
@param batches iterable of HiveBatchContexts i.e. VRBs and their meta information
@return the adjusted iterable of HiveBatchContexts
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/vector/HiveDeleteFilter.java