From 2a77726f9451a0a0ebd290bdbe2f7c7dc2fc35fe Mon Sep 17 00:00:00 2001
From: Philip O'Toole <philip@influxdb.com>
Date: Fri, 14 Aug 2015 16:00:12 -0700
Subject: [PATCH] No need to list, just take map's size

A particular test query goes from 2 minutes 40 seconds to 1 minute 25
seconds.
---
 tsdb/executor.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tsdb/executor.go b/tsdb/executor.go
index 3f2047a86c..859307a636 100644
--- a/tsdb/executor.go
+++ b/tsdb/executor.go
@@ -478,7 +478,7 @@ func (e *Executor) executeAggregate(out chan *influxql.Row) {
 		values = e.processDerivative(values)
 
 		// If we have multiple tag sets we'll want to filter out the empty ones
-		if len(availTagSets.list()) > 1 && resultsEmpty(values) {
+		if len(availTagSets) > 1 && resultsEmpty(values) {
 			continue
 		}