Source code for tests.system.apache.impala.example_impala

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"""
This is an example DAG for the use of the SQLExecuteQueryOperator with Impala.
"""

from __future__ import annotations

import datetime

from airflow import DAG
from airflow.providers.common.sql.operators.sql import SQLExecuteQueryOperator


[docs]
DAG_ID = "example_impala"


with DAG(
    dag_id=DAG_ID,
    start_date=datetime.datetime(2025, 1, 1),
    default_args={"conn_id": "my_impala_conn"},
    schedule="@once",
    catchup=False,
) as dag:
    # [START howto_operator_impala]


[docs]
    create_table_impala_task = SQLExecuteQueryOperator(
        task_id="create_table_impala",
        sql="""
            CREATE TABLE IF NOT EXISTS impala_example (
                a STRING,
                b INT
            )
            PARTITIONED BY (c INT)
        """,
    )


    # [END howto_operator_impala]

    alter_table_impala_task = SQLExecuteQueryOperator(
        task_id="alter_table_impala",
        sql="ALTER TABLE impala_example ADD PARTITION (c=1)",
    )

    insert_data_impala_task = SQLExecuteQueryOperator(
        task_id="insert_data_impala",
        sql="INSERT INTO impala_example PARTITION (c=1) VALUES ('a', 1), ('a', 2), ('b', 3)",
    )

    select_data_impala_task = SQLExecuteQueryOperator(
        task_id="select_data_impala",
        sql="SELECT * FROM impala_example",
    )

    drop_table_impala_task = SQLExecuteQueryOperator(
        task_id="drop_table_impala",
        sql="DROP TABLE impala_example",
    )

    (
        create_table_impala_task
        >> alter_table_impala_task
        >> insert_data_impala_task
        >> select_data_impala_task
        >> drop_table_impala_task
    )

    from tests_common.test_utils.watcher import watcher

    # This test needs watcher in order to properly mark success/failure
    # when "tearDown" task with trigger rule is part of the DAG
    list(dag.tasks) >> watcher()

from tests_common.test_utils.system_tests import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)

[docs]
test_run = get_test_run(dag)