Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8635#discussion_r38991612
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/UnsafeRowSerializer.scala
---
@@ -72,7 +72,6 @@ private class UnsafeRowSerializerInstance(numFields: Int)
extends SerializerInst
override def writeKey[T: ClassTag](key: T): SerializationStream = {
// The key is only needed on the map side when computing partition
ids. It does not need to
// be shuffled.
- assert(key.isInstanceOf[Int])
--- End diff --
yeah I like that better. We can't have a partition ID of `-1`
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