feat: add _from_glob_path and update tests

Author: shuoweil

packages/bigframes/bigframes/session/__init__.py

@@ -2309,6 +2309,16 @@ def _start_query_ml_ddl(
         )
         return iterator, query_job
 
+    def _from_glob_path(
+        self, path: str, *, connection: Optional[str] = None, name: Optional[str] = None
+    ) -> dataframe.DataFrame:
+        """Create a BigFrames DataFrame that contains a BigFrames ObjectRef column from a global wildcard path."""
+        import bigframes.bigquery as bq
+        connection = self._create_bq_connection(connection=connection)
+        table = self._create_object_table(path, connection)
+        s = bq.obj.make_ref(self._loader.read_gbq_table(table)["uri"], authorizer=connection)
+        return s.rename(name).to_frame()
+
     def _create_object_table(self, path: str, connection: str) -> str:
         """Create a random id Object Table from the input path and connection."""
         table = str(self._anon_dataset_manager.generate_unique_resource_id())

packages/bigframes/tests/system/large/operations/test_ai.py

@@ -64,7 +64,7 @@ def test_filter_multi_model(session, gemini_flash_model):
         THRESHOLD_OPTION,
         10,
     ):
-        df = session.from_glob_path(
+        df = session._from_glob_path(
             "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"
         )
         df["prey"] = series.Series(
@@ -238,7 +238,7 @@ def test_map_multimodel(session, gemini_flash_model):
         THRESHOLD_OPTION,
         10,
     ):
-        df = session.from_glob_path(
+        df = session._from_glob_path(
             "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"
         )
         df["scenario"] = series.Series(

packages/bigframes/tests/system/large/operations/test_semantics.py

@@ -411,7 +411,7 @@ def test_filter_multi_model(session, gemini_flash_model):
         THRESHOLD_OPTION,
         10,
     ):
-        df = session.from_glob_path(
+        df = session._from_glob_path(
             "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"
         )
         df["prey"] = series.Series(
@@ -580,7 +580,7 @@ def test_map_multimodel(session, gemini_flash_model):
         THRESHOLD_OPTION,
         10,
     ):
-        df = session.from_glob_path(
+        df = session._from_glob_path(
             "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"
         )
         df["scenario"] = series.Series(