Github user zhzhan commented on the issue:
https://github.com/apache/spark/pull/18694
If it is assumed that the pipeline is as simple as one stage only has one
operator need to spill, you are right. But if the pipeline is more complex, for
example multiple operator needs to spill, this leak can cause serious issue.
A more elegant way is to expose a new interface, e.g., close() for
RowIterator. If it is agreed, we can implement that and solve the issue without
overhead.
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