Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/10605#discussion_r49219913
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Window.scala ---
@@ -307,27 +314,63 @@ case class Window(
// Collect all the rows in the current partition.
// Before we start to fetch new input rows, make a copy of
nextGroup.
val currentGroup = nextGroup.copy()
- rows.clear()
+
+ // clear last partition
+ if (sorter != null) {
+ // the last sorter of this task will be cleaned up via task
completion listener
+ sorter.cleanupResources()
+ sorter = null
+ } else {
+ rows.clear()
+ }
+
while (nextRowAvailable && nextGroup == currentGroup) {
- rows += nextRow.copy()
+ if (sorter == null) {
+ rows += nextRow.copy()
+
+ if (rows.length >= 4096) {
--- End diff --
+1 on making this configurable
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