Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8535#discussion_r39116794
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
---
@@ -163,6 +164,63 @@ private[joins] object HashedRelation {
new GeneralHashedRelation(hashTable)
}
}
+
+ /**
+ * Consume a `LocalNode` to create a `HashedRelation`. Because
`LocalNode` is not an `Iterator`,
+ * we cannot use `apply` directly. Moreover, to avoid creating another
layer of `Iterator`, we
+ * have to duplicate most codes of `apply` here.
--- End diff --
I wrote some code for this. Feel free to steal or come up with something
better. (not tested!)
```
/**
* An thin wrapper around a [[LocalNode]] that provides an iterator
interface.
*/
private class LocalNodeIterator(localNode: LocalNode) extends
Iterator[InternalRow] {
private var nextRow: InternalRow = _
override def hasNext: Boolean = {
if (nextRow == null) {
val res = localNode.next()
if (res) {
nextRow = localNode.fetch()
}
res
} else {
true
}
}
override def next(): InternalRow = {
if (hasNext) {
val res = nextRow
nextRow = null
res
} else {
throw new NoSuchElementException
}
}
}
```
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