Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9330#discussion_r43249474
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/GroupedIterator.scala ---
@@ -83,11 +83,12 @@ class GroupedIterator private(
/** Holds a copy of an input row that is in the current group. */
var currentGroup = currentRow.copy()
- var currentIterator: Iterator[InternalRow] = null
+
assert(keyOrdering.compare(currentGroup, currentRow) == 0)
+ var currentIterator = createGroupValuesIterator()
// Return true if we already have the next iterator or fetching a new
iterator is successful.
- def hasNext: Boolean = currentIterator != null || fetchNextGroupIterator
+ def hasNext: Boolean = currentIterator.ne(null) || fetchNextGroupIterator
--- End diff --
I think these are the same, and I prefer the idiomatic version.
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