ashb opened a new pull request, #22975:
URL: https://github.com/apache/airflow/pull/22975
Many operators do some type validation inside `__init__`
(DateTimeSensor for instance -- which requires a str or a datetime)
which then fail when mapped as they get an XComArg instead.
To fix this we have had to change the order we unmap and resolve
templates:
- first we get the unmapping kwargs, we resolve expansion/mapping args
in that
- Then we create the operator (this should fix the constructor getting
XComArg problem)
- Then we render templates, but only for values that _weren't_ expanded
already
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