From c2d5f2be9c526782b1041257e2fe60155d90eb57 Mon Sep 17 00:00:00 2001
From: msyyc <70930885+msyyc@users.noreply.github.com>
Date: Tue, 14 Sep 2021 16:52:11 +0800
Subject: [PATCH] Update change_log.py (#20680)

---
 tools/azure-sdk-tools/packaging_tools/change_log.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/azure-sdk-tools/packaging_tools/change_log.py b/tools/azure-sdk-tools/packaging_tools/change_log.py
index 64d2ebe0b6b2..10fc7ae47fff 100644
--- a/tools/azure-sdk-tools/packaging_tools/change_log.py
+++ b/tools/azure-sdk-tools/packaging_tools/change_log.py
@@ -142,7 +142,8 @@ def models(self, diff_entry):
 def build_change_log(old_report, new_report):
     change_log = ChangeLog(old_report, new_report)
 
-    result = diff(old_report, new_report)
+    # when diff result is large,  compare_lengths=True may cause wrong result
+    result = diff(old_report, new_report, compare_lengths=False)
 
     for diff_line in result:
         # Operations