srivignessh opened a new pull request #5611: [AIRFLOW 4724] Make params dict to 
be templated for operators
URL: https://github.com/apache/airflow/pull/5611
 
 
   Make sure you have checked _all_ steps below.
   
   ### Description
   
   I am proposing this change to fix the following bug
   ```
   EXEC_TIMESEPOCH =  "{{ execution_date.strftime('%s') }}"
   gcs_export_uri_template_filename = 'product_dwh-' + EXEC_TIMESEPOCH + '.csv'
   upload_file_ftp_op = BashOperator(
      task_id='upload_file_ftp_task',
      params={'filename':gcs_export_uri_template_filename},
      bash_command="python3.6 /home/ubuntu/airflow/scripts/ranker.py  '{{ 
params.filename }}'  " ,
     dag=dag)
   ```
   
   Gives:
   ```
   python3.6 /home/ubuntu/airflow/scripts/ranker.py  'product_dwh-{{ 
execution_date.strftime('%s') }}.csv'
   ```
   
   Expected:
   ```
   python3.6 /home/ubuntu/airflow/scripts/ranker.py  product_dwh-1433142000.csv
   ```
   
   I have noticed that params was available in jinja context but it wasn't 
templated as it was nested. 
   Hence, running the result once again in the same context obtained the 
required result.
   
   I request the reviewers for further comments.
   
   If this approach is good to go. I will append the commit with test cases.
   
   Thanks,
   Srivignessh

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