class_docstr: Entry point for reading data from Cloud BigQuery.
docstr: Retrieves rows (including values) from the BigQuery service.
  
  Args:
      stream: name of the stream to read from.
      offset: Position in the stream.
  
  Returns:
      A `tf.data.Dataset` returning the row keys and the cell contents.
  
  Raises:
      ValueError: If the configured probability is unexpected.
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code: def read_rows(self, stream, offset=0):
      """Retrieves rows (including values) from the BigQuery service.
  
      Args:
          stream: name of the stream to read from.
          offset: Position in the stream.
  
      Returns:
          A `tf.data.Dataset` returning the row keys and the cell contents.
  
      Raises:
          ValueError: If the configured probability is unexpected.
      """
      return _BigQueryDataset(
          self._client_resource,
          self._selected_fields,
          self._selected_fields_repeated,
          self._output_types,
          self._default_values,
          self._schema,
          self._data_format,
          stream,
          offset,
      )
  
imports: import collections
  import enum
  import tensorflow
  from operator import itemgetter
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.util import deprecation
  from tensorflow_io.python.ops import core_ops
label_desc: Use image node_id 3 for calling the BigQueryReadSession obj's underlying member method code with example usage: obj.read_rows(stream, offset) and returns: _BigQueryDataset