kaxil opened a new pull request #15395:
URL: https://github.com/apache/airflow/pull/15395
This bug got introduced in #14909.
The following DAG errors with: `TypeError: '<' not supported between
instances of 'dict' and 'dict'`
```python
from airflow import models
from airflow.operators.dummy import DummyOperator
from datetime import datetime, timedelta
params = {
"staging_schema": [{"key:":"foo","value":"bar"},
{"key:":"this","value":"that"}]
}
with models.DAG(dag_id='test-dag',
start_date=datetime(2019, 2, 14),
schedule_interval='30 13 * * *',
catchup=False,
max_active_runs=1,
params=params
) as dag:
my_task = DummyOperator(
task_id='task1'
)
```
Full Error:
```
File
"/usr/local/lib/python3.7/site-packages/airflow/serialization/serialized_objects.py",
line 210, in <dictcomp>
return cls._encode({str(k): cls._serialize(v) for k, v in var.items()},
type_=DAT.DICT)
File
"/usr/local/lib/python3.7/site-packages/airflow/serialization/serialized_objects.py",
line 212, in _serialize
return sorted(cls._serialize(v) for v in var)
TypeError: '<' not supported between instances of 'dict' and 'dict'
During handling of the above exception, another exception occurred:
...
```
This is because `sorted()` does not work with dict as it can't compare.
It also fails when we have list/set/dict with multiple types
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