[GitHub] [spark] zsxwing commented on a diff in pull request #40776: [SPARK-43123][SQL] Internal field metadata should not be leaked to catalogs

["zsxwing (via GitHub)" <gi...@apache.org>]

zsxwing commented on code in PR #40776:
URL: https://github.com/apache/spark/pull/40776#discussion_r1168134689


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/package.scala:
##########
@@ -225,4 +226,25 @@ package object util extends Logging {
       }
     }
   }
+
+  val AUTO_GENERATED_ALIAS = "__autoGeneratedAlias"
+
+  val INTERNAL_METADATA_KEYS = Seq(
+    AUTO_GENERATED_ALIAS,

Review Comment:
   Are these metadata keys only in the top level columns?



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