Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15764#discussion_r86494337
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala ---
    @@ -131,6 +131,26 @@ case class CreateViewCommand(
             s"specified by CREATE VIEW (num: 
`${userSpecifiedColumns.length}`).")
         }
     
    +    // When creating a permanent view, not allowed to reference temporary 
objects.
    +    if (!isTemporary) {
    +      child.collect {
    +        // Disallow creating permanent views based on temporary views.
    --- End diff --
    
    i'd also copy paste what you put in the pr description in here, on why you 
are traversing the unresolved plan.



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