我正在尝试在使用用户定义函数(UDF)的 Airflow(使用 Google 的 Composer)任务中运行一个基本的 bigquery 运算符。
该示例来自https://cloud.google.com/bigquery/docs/reference/standard-sql/user-defined-functions并在 BigQuery 中完美运行。
但是,当我上传到作曲家时,我得到“未找到函数:multiplyInputs ...”请参见下面的 python 脚本。
BigQueryOperator 的 udf_config 字段需要一个列表,所以我将我的 UDF 定义为一个包含一个字符串的列表 - 不确定这是否正确,因为它显然没有注册为 UDF
任何帮助将不胜感激。
import datetime
from airflow import models
from airflow.contrib.operators import bigquery_operator
yesterday = datetime.datetime.combine(datetime.datetime.today() -
datetime.timedelta(1),
datetime.datetime.min.time())
default_dag_args = {
# Setting start date as yesterday starts the DAG
immediately when it is
# detected in the Cloud Storage bucket.
'start_date': yesterday,
# To email on failure or retry set 'email' arg to your
email and enable
# emailing here.
'email_on_failure': False,
'email_on_retry': False,
# If a task fails, retry it once after waiting at least
5 minutes
'retries': 1,
'retry_delay': datetime.timedelta(minutes=5),
'project_id': 'vital-platform-791'
}
with models.DAG('udf_example',
schedule_interval=datetime.timedelta(days=1),
default_args=default_dag_args) as dag:
table = 'udf_table'
# flatten fe table
task_id = table + '_fe'
udf_config = ["""CREATE TEMPORARY FUNCTION multiplyInputs(x
FLOAT64, y FLOAT64)
RETURNS FLOAT64
LANGUAGE js AS \"""
return x*y;
\""";
"""]
print udf_config
query = """WITH numbers AS
(SELECT 1 AS x, 5 as y
UNION ALL
SELECT 2 AS x, 10 as y
UNION ALL
SELECT 3 as x, 15 as y)
SELECT x, y, multiplyInputs(x, y) as product
FROM numbers"""
print query
query = query
destination_table = 'vital-platform-791.alpha_factors.
{table}_fe'.format(table=table)
t_fe = bigquery_operator.BigQueryOperator(task_id=task_id,
bql=query,
destination_dataset_table=destination_table,
use_legacy_sql=False,
write_disposition='WRITE_TRUNCATE',
udf_config=udf_config)