From 32e0d2376fe91e76be04bb62825af5d95737b13e Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Tue, 2 Oct 2018 19:44:54 +0200
Subject: [PATCH] streamAppendItem(): Update the radix tree pointer only if
 changed.

---
 src/t_stream.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/t_stream.c b/src/t_stream.c
index 1279d8fa..7dcd18f4 100644
--- a/src/t_stream.c
+++ b/src/t_stream.c
@@ -349,7 +349,8 @@ int streamAppendItem(stream *s, robj **argv, int64_t numfields, streamID *added_
     lp = lpAppendInteger(lp,lp_count);
 
     /* Insert back into the tree in order to update the listpack pointer. */
-    raxInsert(s->rax,(unsigned char*)&rax_key,sizeof(rax_key),lp,NULL);
+    if (ri.data != lp)
+        raxInsert(s->rax,(unsigned char*)&rax_key,sizeof(rax_key),lp,NULL);
     s->length++;
     s->last_id = id;
     if (added_id) *added_id = id;