juliuszsompolski commented on PR #43745:
URL: https://github.com/apache/spark/pull/43745#issuecomment-1805629299
@LuciferYang I did a comparison:
```
class FooIter extends scala.collection.Iterator[Int] {
var i = 0
override def hasNext: Boolean = i < 10
override def next(): Int = {
i = i + 1
println(s"$i")
i
}
}
val a = new FooIter()
a.toBuffer
val b = new FooIter()
b.toSeq
```
and in 2.13 I get
```
val b: FooIter = <iterator>
val res10: Seq[Int] = List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
```
while in 2.12 I get
```
scala> b.toSeq
1
res1: Seq[Int] = Stream(1, ?)
```
So it seems that in 2.13 `.toSeq` should be fine to materialize the
stream... but as said above, it would be great to have a test...
Actually, without access to `session` I think that does `val iter =
client.execute` with something that has multiple responses, then `iter.toSeq`,
then grabs the `ExecutePlanResponseReattachableIterator` from inside the iter
and asserts that `resultComplete == true` would be sufficient.
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