SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayEnumerateDense (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList
      Function array (children 1)
       ExpressionList (children 1)
        Function sequenceCount (children 1)
         ExpressionList (children 1)
          Literal NULL