maropu commented on a change in pull request #28726:
URL: https://github.com/apache/spark/pull/28726#discussion_r437178386



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
##########
@@ -85,6 +85,7 @@ trait NamedExpression extends Expression {
    *    e.g. top level attributes aliased in the SELECT clause, or column from 
a LocalRelation.
    * 2. Seq with a Single element: either the table name or the alias name of 
the table.
    * 3. Seq with 2 elements: database name and table name
+   * 4. Seq with 3 elements: catalog name, database name and table name

Review comment:
       Yea, it looks fine as it is.




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