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# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import typing
if typing.TYPE_CHECKING:
from google.cloud import bigquery
def client_query_dry_run() -> "bigquery.QueryJob":
# [START bigquery_query_dry_run]
from google.cloud import bigquery
# Construct a BigQuery client object.
client = bigquery.Client()
job_config = bigquery.QueryJobConfig(dry_run=True, use_query_cache=False)
# Start the query, passing in the extra configuration.
query_job = client.query(
(
"SELECT name, COUNT(*) as name_count "
"FROM `bigquery-public-data.usa_names.usa_1910_2013` "
"WHERE state = 'WA' "
"GROUP BY name"
),
job_config=job_config,
) # Make an API request.
# A dry run query completes immediately.
print("This query will process {} bytes.".format(query_job.total_bytes_processed))
# [END bigquery_query_dry_run]
return query_job
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