feat: append column method

orm/query.go

@@ -360,6 +360,30 @@ func (q *Query) ExcludeColumn(columns ...string) *Query {
 	return q
 }
 
+// AppendColumn appends column to the list of default columns if they weren't set,
+// while Column method overrides defaults
+func (q *Query) AppendColumn(columns ...string) *Query {
+	t := q.tableModel.Table()
+	if q.columns == nil {
+		for _, f := range t.Fields {
+			q.columns = append(q.columns, SafeQuery("?.?", t.Alias, f.Column))
+		}
+	}
+	return q.Column(columns...)
+}
+
+// AppendColumnExpr appends column expression to the list of default columns if they weren't set,
+// while ColumnExpr method overrides defaults
+func (q *Query) AppendColumnExpr(expr string, params ...interface{}) *Query {
+	t := q.tableModel.Table()
+	if q.columns == nil {
+		for _, f := range t.Fields {
+			q.columns = append(q.columns, SafeQuery("?.?", t.Alias, f.Column))
+		}
+	}
+	return q.ColumnExpr(expr, params...)
+}
+
 func (q *Query) excludeColumn(column string) bool {
 	for i := 0; i < len(q.columns); i++ {
 		app, ok := q.columns[i].(fieldAppender)