Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9937#discussion_r45881424
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala
---
@@ -216,7 +216,7 @@ case class ExpressionEncoder[T](
def assertUnresolved(): Unit = {
(fromRowExpression +: toRowExpressions).foreach(_.foreach {
case a: AttributeReference =>
- sys.error(s"Unresolved encoder expected, but $a was found.")
--- End diff --
this is not right, we may have attribute `loopVar` in `MapObjects`.
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