mcdull-zhang commented on a change in pull request #35836:
URL: https://github.com/apache/spark/pull/35836#discussion_r825935595
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
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@@ -397,6 +398,7 @@ private[joins] class UnsafeHashedRelation(
readInt: () => Int,
readLong: () => Long,
readBuffer: (Array[Byte], Int, Int) => Unit): Unit = {
+ numKeys = readInt()
Review comment:
This field has not been serialized from the beginning.
The reason why this problem was not triggered before is because
TorrentBroadcast._value is like this:
`private lazy val _value: T = readBroadcastBlock()`
It was modified after #22995 and became like this:
`private var _value: SoftReference[T] = _`
The driver side may deserialize UnsafeHashedRelation, and then cause this
problem.
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