Github user jiexiong commented on the issue:
https://github.com/apache/spark/pull/15722
Here is my understanding: after spilling, it would call reset() to release
the memory. In the reset() function, it deletes all the memory pages, but it
did not release any memory from longArray(). So the longArray will keep
growing. By freeing up the array and allocate only the initial size to it, we
can ensure the longArray would not grow indefinitely.
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