load large data from bigquery to python

from google.cloud import bigquery as bq
import google_auth_oauthlib.flow

query = '''select ... from ...'''

bigquery_client = bq.Client()
table = bq.query.QueryResults(query=query,client=bigquery_client)
table.use_legacy_sql = False
table.run()

# transfer bigquery data to pandas dataframe
columns=[field.name for field in table.schema]
rows = table.fetch_data()
data = []
for row in rows:
    data.append(row)

df = pd.DataFrame(data=data[0],columns=columns)

I want to load more than 10 million rows into python and it worked fine a few weeks ago, but now it only returns 100,000 rows. Anyone knows a reliable way to do this?