VBhojawala opened a new pull request #13890:
URL: https://github.com/apache/airflow/pull/13890
added template_fields to support upstream task ordering by xcom .
``` python
from airflow.models import DAG
from airflow.providers.postgres.operators.postgres import PostgresOperator
import os
from airflow.utils.dates import days_ago
default_args = {'start_date': days_ago(1)}
dag_name = os.path.splitext(os.path.basename(__file__))[0]
with DAG(dag_name, default_args=default_args) as dag:
@dag.task
def some_py_task() -> str:
return some_str
some_str = some_py_task()
some_pg_task = PostgresOperator(task_id='some_pg_task',
sql='select * from %s',
parameters=[some_str],
postgres_conn_id='postgres_bob')
```
closes : #13823
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