LuciferYang commented on PR #37339:
URL: https://github.com/apache/spark/pull/37339#issuecomment-1199192546
do the following change in Scala 2.13, the performance of
`Utils#getIteratorSize` method will be significantly improved, but this is for
Scala 2.13:
```scala
def getIteratorSize(iterator: Iterator[_]): Long = {
if (iterator.knownSize > 0) {
iterator.knownSize.toLong
} else {
var count = 0L
while (iterator.hasNext) {
count += 1L
iterator.next()
}
count
}
}
```
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