From 7fefccd92996688f9c1582762c497b699166541c Mon Sep 17 00:00:00 2001
From: Julius Volz <julius.volz@gmail.com>
Date: Sat, 21 Feb 2015 17:19:13 +0100
Subject: [PATCH] Write() directly into hash and use model.SeparatorByte.

---
 rules/ast/ast.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/ast/ast.go b/rules/ast/ast.go
index 7e891edd8..8eae7359a 100644
--- a/rules/ast/ast.go
+++ b/rules/ast/ast.go
@@ -375,8 +375,8 @@ func (node *ScalarFunctionCall) Eval(timestamp clientmodel.Timestamp) clientmode
 func (node *VectorAggregation) labelsToGroupingKey(labels clientmodel.Metric) uint64 {
 	summer := fnv.New64a()
 	for _, label := range node.groupBy {
-		fmt.Fprint(summer, labels[label])
-		fmt.Fprint(summer, []byte{0})
+		summer.Write([]byte(labels[label]))
+		summer.Write([]byte{clientmodel.SeparatorByte})
 	}
 
 	return summer.Sum64()