Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18541
Did a small test:
2000200 rows in the `UnsafeExternalSorter`: 2 spill files(each contains
1000000 rows) and `inMemSorter` contains 200 rows.
I want to target the iterator to index=2000001.
With this change: `getIterator(2000001)`, it will cost almost 0ms~1ms;
Without this change:
`for(int i=0; i<2000001; i++)geIterator().loadNext()`, it will cost 300ms;
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