Tao Feng created AIRFLOW-2172:
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Summary: Cast template_fields into a list if the operator's
template_fields has only one element
Key: AIRFLOW-2172
URL: https://issues.apache.org/jira/browse/AIRFLOW-2172
Project: Apache Airflow
Issue Type: Bug
Reporter: Tao Feng
Assignee: Tao Feng
Normally user defined operator is derived from BaseOperator. And a jinjafied
tuple is created for template_fields. If only one field is provided in the
operator's template_fields as following for example:
template_fields = ('hql')
the resolve_template_files method in BaseOperator actually will throw an
exception, as the template_fields is now considered as a string instead of a
list/tuple. In the example, 'h', 'q', 'l' will all consider template field
attribute.
The workaround is to cast template_frields into a list when its actual type is
a string. Not sure it is a real bug, but it takes me some time to figure out
this issue...
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