karenfeng commented on a change in pull request #31666:
URL: https://github.com/apache/spark/pull/31666#discussion_r608299765
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
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@@ -77,6 +77,14 @@ case class Project(projectList: Seq[NamedExpression], child:
LogicalPlan)
override lazy val validConstraints: ExpressionSet =
getAllValidConstraints(projectList)
+
+ override def metadataOutput: Seq[Attribute] =
+ child.metadataOutput.filter(_.isHiddenCol) ++
Review comment:
This is needed to propagate hidden columns through nested Projections
(eg. multiple natural joins).
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