Add DataflowStartSQLQuery operator (#8553)

Author: mik-laj

airflow/providers/google/cloud/example_dags/example_dataflow_sql.py

@@ -0,0 +1,63 @@
+#
+# 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.
+
+"""
+Example Airflow DAG for Google Cloud Dataflow service
+"""
+import os
+
+from airflow import models
+from airflow.providers.google.cloud.operators.dataflow import DataflowStartSqlJobOperator
+from airflow.utils.dates import days_ago
+
+GCP_PROJECT_ID = os.environ.get("GCP_PROJECT_ID", "example-project")
+
+BQ_SQL_DATASET = os.environ.get("DATAFLOW_BQ_SQL_DATASET", "airflow_dataflow_samples")
+BQ_SQL_TABLE_INPUT = os.environ.get("BQ_SQL_TABLE_INPUT", "beam_input")
+BQ_SQL_TABLE_OUTPUT = os.environ.get("BQ_SQL_TABLE_OUTPUT", "beam_output")
+DATAFLOW_SQL_JOB_NAME = os.environ.get("DATAFLOW_SQL_JOB_NAME", "dataflow-sql")
+DATAFLOW_SQL_LOCATION = os.environ.get("DATAFLOW_SQL_LOCATION", "us-west1")
+
+with models.DAG(
+    dag_id="example_gcp_dataflow_sql",
+    start_date=days_ago(1),
+    schedule_interval=None,  # Override to match your needs
+    tags=['example'],
+) as dag_sql:
+    start_sql = DataflowStartSqlJobOperator(
+        task_id="start_sql_query",
+        job_name=DATAFLOW_SQL_JOB_NAME,
+        query=f"""
+            SELECT
+                sales_region as sales_region,
+                count(state_id) as count_state
+            FROM
+                bigquery.table.`{GCP_PROJECT_ID}`.`{BQ_SQL_DATASET}`.`{BQ_SQL_TABLE_INPUT}`
+            WHERE state_id >= @state_id_min
+            GROUP BY sales_region;
+        """,
+        options={
+            "bigquery-project": GCP_PROJECT_ID,
+            "bigquery-dataset": BQ_SQL_DATASET,
+            "bigquery-table": BQ_SQL_TABLE_OUTPUT,
+            "bigquery-write-disposition": "write-truncate",
+            "parameter": "state_id_min:INT64:2",
+        },
+        location=DATAFLOW_SQL_LOCATION,
+        do_xcom_push=True,
+    )