SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function CAST (alias x) (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toFloat32 (children 1)
         ExpressionList (children 1)
          Literal UInt64_2
      Literal \'UInt8\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x