show compute nodes bug

[pengliang100]

    r := strings.NewReader(sql)
tokens := sqlparser.NewTokenizer(r)
for {
	stmt, err := sqlparser.ParseNext(tokens)
	var isQuery bool
	var sqlErr error
	if err != nil {
		if err == io.EOF {
			break
		}
	} 
     sqlparser.String(stmt),		
}

show compute nodes --> sqlparser.String(stmt), ---> show compute