Github user viirya 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.
There're few places in `Dataset` directly calling `QueryExecution.toRdd`,
which uses the materialized query plan that still contains cached relation.
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