cloud-fan commented on a change in pull request #29585:
URL: https://github.com/apache/spark/pull/29585#discussion_r490745876
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
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@@ -266,7 +266,7 @@ case class Union(
firstAttr.withNullability(nullable)
} else {
AttributeReference(firstAttr.name, newDt, nullable,
firstAttr.metadata)(
- firstAttr.exprId, firstAttr.qualifier)
+ NamedExpression.newExprId, firstAttr.qualifier)
Review comment:
This change is risky. We are generating new expr ID in `def output`,
which means the output of this plan is changing everytime you call `output`.
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