From 86bb085f041bddd0efd2d22ad5f66607a5eae07c Mon Sep 17 00:00:00 2001
From: Jingyi Hu <jingyih@google.com>
Date: Wed, 29 May 2019 17:41:33 -0700
Subject: [PATCH] mvcc: revert change made by 10526

Revert #10526 and its followup #10699.
---
 go.mod        | 2 ++
 mvcc/index.go | 5 ++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index d3fef6a4ffb..8d9b19aeebe 100644
--- a/go.mod
+++ b/go.mod
@@ -59,3 +59,5 @@ require (
 	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
 	gopkg.in/yaml.v2 v2.2.2
 )
+
+go 1.13
diff --git a/mvcc/index.go b/mvcc/index.go
index 8588977890c..f8cc6df88cf 100644
--- a/mvcc/index.go
+++ b/mvcc/index.go
@@ -92,10 +92,9 @@ func (ti *treeIndex) visit(key, end []byte, f func(ki *keyIndex)) {
 	keyi, endi := &keyIndex{key: key}, &keyIndex{key: end}
 
 	ti.RLock()
-	clone := ti.tree.Clone()
-	ti.RUnlock()
+	defer ti.RUnlock()
 
-	clone.AscendGreaterOrEqual(keyi, func(item btree.Item) bool {
+	ti.tree.AscendGreaterOrEqual(keyi, func(item btree.Item) bool {
 		if len(endi.key) > 0 && !item.Less(endi) {
 			return false
 		}