Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22764
Since this PR is a little more complicated than we expect, we decided to
not have it in 2.4.0. I'm not sure if we can treat it as a special case and put
it in 2.4.1, cc @mengxr
Anyway, the other 2 related PRs(deprecating the API and updating the
example) are reverted. We need to think about what we should do if we can only
do this in 3.0.
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