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https://issues.apache.org/jira/browse/AIRFLOW-2172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tao Feng closed AIRFLOW-2172.
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Resolution: Won't Fix
> 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
> Priority: Minor
>
> 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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