rename sql to string seems not available

[WangXiangUSTC]

I use sqlparser parse sql, and the code is below:

    sql := "rename table a to b;"
    tree, err := sqlparser.Parse(sql)
    if err != nil {
            fmt.Println("sql parser failed!")
            return
    }
    out := sqlparser.String(tree)
    fmt.Println(out)

the output is : "rename table a b",
the sql can't run success in mysql, forget add the "to"?