func (s mysql) HasIndex(tableName string, indexName string) bool {
    currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
    if rows, err := s.db.Query(fmt.Sprintf("SHOW INDEXES FROM `%s` FROM `%s` WHERE Key_name = ?", tableName, currentDatabase), indexName); err != nil {
        panic(err)
    } else {