gaogaotiantian commented on PR #56679:
URL: https://github.com/apache/spark/pull/56679#issuecomment-4775385873

   Yeah I will delete the unused env vars.
   
   The problem for Python version is that the existing `build_and_test.yml` on 
`branch-3.5` does not support a way to define Python version - 
https://github.com/apache/spark/blob/03733f171795a9da8fcadf4915d323f442129118/.github/workflows/build_and_test.yml#L441
 . For `master`, we use variables like `$PYTHON_TO_TEST` to configure which 
python to test, and also which docker image should be used. For `branch-3.5`, 
we use one docker image (based on the branch we passed in) and we hardcode the 
Python version. If we want to test different python versions on `branch-3.5`, 
we need to backport some of the CI code in `master` back to `branch-3.5`, which 
should not be too difficult - at least we only need to do this to `branch-3.5` 
after the CI decoupling.


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