util.go
func ColumnName(d Dialect, tname, cname string) string {
	if cname != "*" {
		cname = d.Quote(cname)
	}
	if tname == "" {
		return cname
	}
	return fmt.Sprintf("%s.%s", d.Quote(tname), cname)
}
func ColumnName(d Dialect, tname, cname string) string {
	if cname != "*" {
		cname = d.Quote(cname)
	}
	if tname == "" {
		return cname
	}
	return fmt.Sprintf("%s.%s", d.Quote(tname), cname)
}
// columnName returns the column name that added the table name with quoted if needed.