cloud-fan commented on code in PR #49445:
URL: https://github.com/apache/spark/pull/49445#discussion_r1954762992


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/ParserUtils.scala:
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@@ -350,3 +357,12 @@ class SqlScriptingLabelContext {
     }
   }
 }
+
+object SqlScriptingLabelContext {
+  private val forbiddenLabelNames: immutable.Set[Regex] =
+    immutable.Set("builtin".r, "session".r, "sys.*".r)

Review Comment:
   I'm not super familiar with the scala regex API. If you have verified that 
it matches `builtin` literally, we are good.



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