SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList (children 1)
      Function nullIn (children 1)
       ExpressionList (children 2)
        Literal NULL
        Function tuple (children 1)
         ExpressionList (children 1)
          Literal NULL