Jeremiah Lowin created AIRFLOW-915:
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Summary: Allow task context to be modified by pre_execute hook
Key: AIRFLOW-915
URL: https://issues.apache.org/jira/browse/AIRFLOW-915
Project: Apache Airflow
Issue Type: Improvement
Components: operators
Affects Versions: 1.8.0
Reporter: Jeremiah Lowin
Priority: Minor
Currently, Operators do two things that prevent the pre_execute hook from
modifying the jinja context:
1. the Operator templates are rendered immediately BEFORE calling pre_execute
2. even though a context was already generated for the operator, the context is
regenerated for template rendering, meaning that modifications to the operator
context wouldn't matter anyway.
The proper course of events should be:
1. generate operator context
2. pass context to pre_execute where it could (potentially) be modified
3. use that context to render operator templates
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