Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/22043#discussion_r209016366
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -367,6 +367,7 @@ case class AppendData(
case (inAttr, outAttr) =>
// names and types must match, nullability must be compatible
inAttr.name == outAttr.name &&
+ inAttr.resolved && outAttr.resolved &&
--- End diff --
Agreed.
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