maropu commented on a change in pull request #31913:
URL: https://github.com/apache/spark/pull/31913#discussion_r600518216
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraintExpressions.scala
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@@ -39,3 +39,9 @@ case class KnownNotNull(child: Expression) extends
TaggingExpression {
}
case class KnownFloatingPointNormalized(child: Expression) extends
TaggingExpression
+
+/**
+ * Wrapper expression to avoid further optimizations between the parent and
child of this
+ * expression.
+ */
+case class GroupingExpression(child: Expression) extends TaggingExpression
Review comment:
nit: How about `GroupingExpression` -> `ReferencedByGroupingExpr`?
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