SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (alias c) (children 1)
     ExpressionList (children 2)
      Function plus (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_2
      Literal \'UInt32\'