From 3a697a935a4a7af3505d13230e7d75774ea60f9c Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Wed, 18 Sep 2019 23:24:12 +0300
Subject: [PATCH] lib/storage: skip duplicate call to
 intersectMetricIDsWithTagFilter on zero successful intersects

---
 lib/storage/index_db.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/storage/index_db.go b/lib/storage/index_db.go
index d4b4704f18..ce5858b951 100644
--- a/lib/storage/index_db.go
+++ b/lib/storage/index_db.go
@@ -1561,6 +1561,7 @@ func (is *indexSearch) updateMetricIDsForTagFilters(metricIDs map[uint64]struct{
 
 	// Find intersection of minTf with other tfs.
 	var tfsPostponed []*tagFilter
+	successfulIntersects := 0
 	for i := range tfs.tfs {
 		tf := &tfs.tfs[i]
 		if tf == minTf {
@@ -1577,6 +1578,10 @@ func (is *indexSearch) updateMetricIDsForTagFilters(metricIDs map[uint64]struct{
 			return err
 		}
 		minMetricIDs = mIDs
+		successfulIntersects++
+	}
+	if len(tfsPostponed) > 0 && successfulIntersects == 0 {
+		return is.updateMetricIDsByMetricNameMatch(metricIDs, minMetricIDs, tfsPostponed)
 	}
 	for i, tf := range tfsPostponed {
 		mIDs, err := is.intersectMetricIDsWithTagFilter(tf, minMetricIDs)