Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18687
> Once a dataset is uncached, the same fragment of logical plan in other
datasets should fallback to uncached plan.
This is true, although the plan looks like the same. However, the execution
is not using the cached data.
> Once a dataset is cached, the same fragment of logical plan in other
datasets should use the cached plan.
This is true, if and only if your first execution of `queryExecution` is
after `persist()`. If you check most of our APIs, we are building a new
`QueryExecution`.
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