From 24fa6189b5f13dcfb57a491bb1f20195a19c4d38 Mon Sep 17 00:00:00 2001
From: smori <mori.s@tech.gr.jp>
Date: Sat, 23 Dec 2017 16:41:56 +0900
Subject: [PATCH] fix the issue #2998

---
 migration/ddl.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration/ddl.go b/migration/ddl.go
index cea10355..f04e6949 100644
--- a/migration/ddl.go
+++ b/migration/ddl.go
@@ -322,7 +322,7 @@ func (m *Migration) GetSQL() (sql string) {
 					sql += fmt.Sprintf("\n DROP COLUMN `%s`", column.Name)
 				}
 
-				if len(m.Columns) > index {
+				if len(m.Columns) > index+1 {
 					sql += ","
 				}
 			}