viirya commented on a change in pull request #34038:
URL: https://github.com/apache/spark/pull/34038#discussion_r714202853
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
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@@ -327,7 +327,7 @@ case class Union(
child.output.length == children.head.output.length &&
// compare the data types with the first child
child.output.zip(children.head.output).forall {
- case (l, r) => l.dataType.sameType(r.dataType)
+ case (l, r) => DataType.equalsStructurally(l.dataType, r.dataType,
true)
Review comment:
`DataType.equalsStructurally` still check data type equality, it just
ignores field name difference.
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