nchammas opened a new pull request #34671:
URL: https://github.com/apache/spark/pull/34671
### What changes were proposed in this pull request?
This PR inlines the type annotations for `{ml, mllib}/common.py`.
### Why are the changes needed?
This allows us to run type checks against the code within both versions of
`common.py`.
This would help contributors catch some issues more easily, like this one:
https://github.com/apache/spark/pull/34606#discussion_r749783512
### Does this PR introduce _any_ user-facing change?
Potentially. The `C` TypeVar is now public.
### How was this patch tested?
Existing tests.
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