Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9969#discussion_r45937304
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java
---
@@ -521,4 +522,60 @@ public long getKeyPrefix() {
return upstream.getKeyPrefix();
}
}
+
+ /**
+ * Returns a iterator. It is the caller's responsibility to call
`cleanupResources()`
--- End diff --
@davies are you trying to save a in-memory sort here?
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