durch opened a new pull request #5488: Add success, failure and fail_on_empty params to SqlSensor URL: https://github.com/apache/airflow/pull/5488 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: This PR enhances `SqlSensor` with three additional parameters that allow for fine tuning of usage. + **success** and **failure** parameters allow for passing in an iterable of values against which the `first_cell` is checked. In case of `success` the sensor keeps poking until `first_cell` is found in the `success` iterable. In case of `failure` an `AirflowException` is raised if `first_cell` is found in the`failure` iterable. `first_cell` is matched against `failure` iterable first. + if **fail_on_empty** parameter is set to `True` an `AirflowException` is raised in case of no rows returned. ### Tests - [x] My PR adds the following unit tests: + `test_sql_sensor_postgres_poke_fail_on_empty` + `test_sql_sensor_postgres_poke_success` + `test_sql_sensor_postgres_poke_failure` + `test_sql_sensor_postgres_poke_failure_success` + `test_sql_sensor_postgres_poke_failure_success_same` ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release ### Code Quality - [x] Passes `flake8`
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