SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Function toInt8 (children 1)
         ExpressionList (children 1)
          Literal UInt64_2
        Literal \'Bool\'
      Literal \'UInt8\'
