karenfeng commented on a change in pull request #31666:
URL: https://github.com/apache/spark/pull/31666#discussion_r608857259
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
##########
@@ -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 was used in `natural-join.sql`:
```
SELECT nt1.*, nt2.*, nt3.* FROM nt1 natural join nt2 natural join nt3;
```
Which would otherwise fail to expand `nt2.*` to include the key column.
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