vachan-shetty commented on a change in pull request #15185:
URL: https://github.com/apache/beam/pull/15185#discussion_r679970997



##########
File path: sdks/python/apache_beam/io/gcp/bigquery.py
##########
@@ -883,6 +890,184 @@ def _export_files(self, bq):
     return table.schema, metadata_list
 
 
+class _CustomBigQueryStorageStreamSourceBase(BoundedSource):
+  """A base class for BoundedSource implementations which read from BigQuery
+  using the BigQuery Storage API."""
+  def __init__(
+      self,
+      project=None,
+      dataset=None,
+      table=None,
+      selected_fields=None,
+      row_restriction=None,
+      pipeline_options=None):
+
+    if table is None:

Review comment:
       Opted for emkornfield's suggestion here and removed default values for 
the parameters. 




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