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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