Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/5577#discussion_r28649628
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala ---
@@ -300,8 +300,8 @@ private[spark] class ExternalSorter[K, V, C](
val partitionId = elem._1._1
val key = elem._1._2
val value = elem._2
- writer.write(key)
- writer.write(value)
+ writer.writeKey(key)
+ writer.writeValue(value)
--- End diff --
@rxin An alternative way to make the specialized SQL serializer work in
most of the cases is to only change
```
writer.write(key)
writer.write(value)
```
to
```
writer.write((key, value))
```
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