SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function caseWithExpression (children 1)
     ExpressionList (children 4)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function assumeNotNull (children 1)
         ExpressionList (children 1)
          Function materialize (children 1)
           ExpressionList (children 1)
            Literal NULL
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal NULL
      Literal NULL
      Literal NULL
