airflow bigquery_get_data 源码
airflow bigquery_get_data 代码
文件路径：/airflow/providers/google/cloud/utils/bigquery_get_data.py
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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
#
# http://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.
from __future__ import annotations
from collections.abc import Iterator
from logging import Logger
from google.cloud.bigquery.table import Row
from airflow.providers.google.cloud.hooks.bigquery import BigQueryHook
def bigquery_get_data(
logger: Logger,
dataset_id: str,
table_id: str,
big_query_hook: BigQueryHook,
batch_size: int,
selected_fields: list[str] | str | None,
) -> Iterator:
logger.info('Fetching Data from:')
logger.info('Dataset: %s ; Table: %s', dataset_id, table_id)
i = 0
while True:
rows: list[Row] = big_query_hook.list_rows(
dataset_id=dataset_id,
table_id=table_id,
max_results=batch_size,
selected_fields=selected_fields,
start_index=i * batch_size,
)
if len(rows) == 0:
logger.info('Job Finished')
return
logger.info('Total Extracted rows: %s', len(rows) + i * batch_size)
yield [row.values() for row in rows]
i += 1
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