SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function toUInt8OrNull (children 1)
       ExpressionList (children 1)
        Literal \'123\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function toUInt8OrZero (children 1)
       ExpressionList (children 1)
        Literal \'123\'
