Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22144
Unfortunately, we didn't drop it mistakenly. It's a mistake and we should
fix it. What I try to avoid is adding back the `supportsPartial` flag. We
should look into the root cause and see how to fix it better.
I don't know if this policy is written down officially, but I do remember
we followed this policy many times in the previous releases. Please correct me
if I am wrong.
I'll list it as a known issue in 2.4.0 release notes. It will be great if
someone can investigate the root cause and propose a fix(with a test).
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