cloud-fan commented on code in PR #44527:
URL: https://github.com/apache/spark/pull/44527#discussion_r1438259318
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala:
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@@ -325,11 +325,17 @@ case class ExpressionEncoder[T](
assert(serializer.forall(_.references.isEmpty), "serializer cannot reference
any attributes.")
assert(serializer.flatMap { ser =>
val boundRefs = ser.collect { case b: BoundReference => b }
- assert(boundRefs.nonEmpty,
- "each serializer expression should contain at least one
`BoundReference`")
+ assert(boundRefs.nonEmpty || isEmptyStruct(ser),
Review Comment:
The change looks correct to me. If a column is StructType, the only reason
that its serialize has no `BoundReference` is it's an empty struct.
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