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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.
def add_empty_column(table_id: str) -> None:
# [START bigquery_add_empty_column]
from google.cloud import bigquery
# Construct a BigQuery client object.
client = bigquery.Client()
# TODO(developer): Set table_id to the ID of the table
# to add an empty column.
# table_id = "your-project.your_dataset.your_table_name"
table = client.get_table(table_id) # Make an API request.
original_schema = table.schema
new_schema = original_schema[:] # Creates a copy of the schema.
new_schema.append(bigquery.SchemaField("phone", "STRING"))
table.schema = new_schema
table = client.update_table(table, ["schema"]) # Make an API request.
if len(table.schema) == len(original_schema) + 1 == len(new_schema):
print("A new column has been added.")
else:
print("The column has not been added.")
# [END bigquery_add_empty_column]
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