cloud-fan commented on code in PR #38395:
URL: https://github.com/apache/spark/pull/38395#discussion_r1008046680


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala:
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@@ -2100,3 +2100,53 @@ object AsOfJoin {
     }
   }
 }
+
+
+/**
+ * A logical plan for summary.
+ */
+case class Summary(

Review Comment:
   they are not a function in my opinion, but more like a dataframe operation. 
e.g. we won't call `df.filter` a DataFrame function.



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