upgrade gcs_to_bq_util to work with pandas 1.4.x (#1652)

- pandas.read_json needs to take in a decoded string
- see pandas-dev/pandas#46935

Author: joshzarrabi

python/ingestion/gcs_to_bq_util.py

@@ -167,6 +167,7 @@ def load_values_blob_as_df(blob):
 
        blob: google.cloud.storage.blob.Blob object"""
     json_string = blob.download_as_string()
+    json_string = json_string.decode('utf-8')
     return values_json_to_df(json_string)
 
 

python/tests/test_gcs_to_bq.py

@@ -22,7 +22,7 @@ def testLoadValuesBlobAsDataframe(self):
         """Tests that data in json list format is loaded into a
            pandas.DataFrame object using the first row as a header."""
         mock_attrs = {
-            'download_as_string.return_value': json.dumps(self._test_data)}
+            'download_as_string.return_value': json.dumps(self._test_data).encode('utf-8')}
         mock_blob = Mock(**mock_attrs)
         frame = gcs_to_bq_util.load_values_blob_as_df(mock_blob)