Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18687
Since you said it is well defined, then I suppose that the coded behavior
of cache:
* Once a dataset is cached, the same fragment of logical plan in other
datasets should use the cached plan.
* Once a dataset is uncached, the same fragment of logical plan in other
datasets should fallback to uncached plan.
is correct and we don't want to change.
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