Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20648
I think we do have an intention to return partial result, but there is no
strict definition for it, and seems there is no public document, so it's kind
of a new feature.
Since this is a non-trivial feature, the first question is: do we want this
feature? There is no JIRA ticket requesting this feature, so I feel it is not
urgent. We can refactor the code to make it more clearly.
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