Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13596
The root cause is: even we uncache an `InMemoryRelation`, this
`InMemoryRelation` may still get executed.
The test case in this PR shows how this happens:
1. we create a DataFrame and cache it
2. execute this DataFrame, to make the analysis, optimization, planning to
happen
3. uncahce this DataFrame, however, `QueryExecution` of this df is already
generated and won't change
4. execute this DataFrame again, it will still run the previous physical
plan and execute an already uncached `InMemoryRelation`.
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