code: public PaginatedParallelScanList<T> parallelScan(DynamoDBScanExpression scanExpression, int totalSegments) {
          return mapper.<T>parallelScan(model.targetType(), scanExpression, totalSegments);
      }
docs: Scans through an Amazon DynamoDB table on logically partitioned segments
  in parallel and returns the matching results in one unmodifiable list of
  instantiated objects.
  @param scanExpression The scan expression.
  @param totalSegments The total segments.
  @return The scan results.
  @see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper#parallelScan