Github user gczsjdy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19862#discussion_r154581844
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/execution/UnsafeExternalRowSorter.java
---
@@ -159,6 +154,12 @@ public boolean hasNext() {
@Override
public UnsafeRow next() {
try {
+ if (!alreadyCalculated) {
--- End diff --
Yes. There are mistakes here, I will change.
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