fix aggregation match bug

Author: baxiry

engine/aggregate.go

@@ -81,6 +81,9 @@ func aggrigate(query gjson.Result) string {
 	if err != nil {
 		return err.Error()
 	}
+	if len(data) == 0 {
+		return "[]"
+	}
 
 	group := query.Get("group")
 	if _id := group.Get("_id"); !_id.Exists() {

engine/coreFuncs.go

@@ -35,10 +35,9 @@ func getData(query gjson.Result) (data []string, err error) {
 	}
 	defer rows.Close()
 
-	record := ""
-
 	isMatch := query.Get("match")
 
+	record := ""
 	for rows.Next() {
 
 		if limit == 0 {

store/store.go

@@ -166,4 +166,7 @@ func (db *Database) Close() error {
 	}
 	clear(db.Collections)
 	return nil
+
 }
+
+// end