Pocoder opened a new pull request, #25160:
URL: https://github.com/apache/airflow/pull/25160
There is no way to change group_id of `@task_group` decorated function
(TaskGroupDecorator) outside of its declaration.
I am following the same style that was proposed in solving the same problem
for `@task` decorated functions #22941:
```python
@task_group
def simple_tg():
...
@dag
def simple_dag():
tg = simple_tg.override(group_id='other_id')()
```
Also this feature allows to change other kwargs of TaskGroup:
```python
@dag
def simple_dag2():
tg = simple_tg.override(default_args={
'pool': 'mypool',
})()
```
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