From 72ceb58fa3e0e484ca27cdfc7fd5f20cd0277561 Mon Sep 17 00:00:00 2001
From: agapple <jianghang.loujh@alibaba-inc.com>
Date: Wed, 2 Dec 2015 14:37:06 +0800
Subject: [PATCH] fixed issue #135 , isUpdate bugfix

---
 .../canal/parse/inbound/mysql/dbsync/LogEventConvert.java    | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/dbsync/LogEventConvert.java b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/dbsync/LogEventConvert.java
index 603f4543..cc092d46 100644
--- a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/dbsync/LogEventConvert.java
+++ b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/dbsync/LogEventConvert.java
@@ -623,8 +623,9 @@ public class LogEventConvert extends AbstractCanalLifeCycle implements BinlogPar
                 if (column.getIsNull() && newValue == null) {
                     // 如果全是null
                     return false;
-                } else if (newValue != null && column.getValue().equals(newValue)) {
-                    // 如果不围null，并且相等
+                } else if (newValue != null && (!column.getIsNull() && column.getValue().equals(newValue))) {
+                    // fixed issue #135, old column is Null
+                    // 如果不为null，并且相等
                     return false;
                 }
             }