Github user logannc commented on the issue:
https://github.com/apache/spark/pull/18945
I read the contributing guide. It said that simple changes didn't need a
JIRA. Certainly this code change is quite simple, I just wasn't sure if there
would be enough discussion to warrant a Jira. Now I know.
So, rather than return np.float32, return None? That would probably also
work, though the bug might get reintroduced by someone unfamiliar with the
problem. That is why I prefered the explicitness of returning a type.
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