From 835d08591efa47d679b7b5bf460105495f8a9722 Mon Sep 17 00:00:00 2001
From: "Jonathan A. Sternberg" <jonathan@influxdb.com>
Date: Wed, 13 Apr 2016 09:11:49 -0400
Subject: [PATCH] Do not filter out empty tags from series keys

---
 tsdb/engine/tsm1/engine.go | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/tsdb/engine/tsm1/engine.go b/tsdb/engine/tsm1/engine.go
index 543101550c..f97a1f17e4 100644
--- a/tsdb/engine/tsm1/engine.go
+++ b/tsdb/engine/tsm1/engine.go
@@ -727,18 +727,9 @@ func (e *Engine) SeriesKeys(opt influxql.IteratorOptions) (influxql.SeriesList,
 		// Calculate tag sets and apply SLIMIT/SOFFSET.
 		tagSets = influxql.LimitTagSets(tagSets, opt.SLimit, opt.SOffset)
 		for _, t := range tagSets {
-			tagMap := make(map[string]string)
-			for k, v := range t.Tags {
-				if v == "" {
-					continue
-				}
-				tagMap[k] = v
-			}
-			tags := influxql.NewTags(tagMap)
-
 			series := influxql.Series{
 				Name: mm.Name,
-				Tags: tags,
+				Tags: influxql.NewTags(t.Tags),
 				Aux:  make([]influxql.DataType, len(opt.Aux)),
 			}