code: func (q Query) toSQLBuilder(model *Model, addColumns ...string) *sqlBuilder {
  	if len(q.addColumns) != 0 {
  		addColumns = q.addColumns
  	}
  	return newSQLBuilder(q, model, addColumns...)
  }
docs: // ToSQLBuilder returns a new `SQLBuilder` that can be used to generate SQL,
  // get arguments, and more.