From 8eabef3c2a249bb0f07c9ad666d98b682143f43c Mon Sep 17 00:00:00 2001
From: Tomasz Pytel <tompytel@gmail.com>
Date: Fri, 20 Nov 2020 13:16:58 -0300
Subject: [PATCH] Fix: Span.tag() for overridable

---
 skywalking/trace/span.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/skywalking/trace/span.py b/skywalking/trace/span.py
index 53c36c736..75157bf79 100644
--- a/skywalking/trace/span.py
+++ b/skywalking/trace/span.py
@@ -91,10 +91,12 @@ def tag(self, tag: Tag) -> 'Span':
             self.tags.append(deepcopy(tag))
             return self
 
-        for t in self.tags:
+        for i, t in enumerate(self.tags):
             if t.key == tag.key:
-                t.val = tag.val
+                self.tags[i] = deepcopy(tag)
                 break
+        else:
+            self.tags.append(deepcopy(tag))
 
         return self