From 88454b3320792a02b6d683e213e414d65fc6df8c Mon Sep 17 00:00:00 2001
From: Aleksey Midenkov <midenok@gmail.com>
Date: Mon, 24 Jul 2017 16:22:59 +0300
Subject: [PATCH] SQL: comment and check about ALTER in update_auto_increment()

---
 sql/handler.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sql/handler.cc b/sql/handler.cc
index 9f4ab646aaa..7e7f161f14f 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -3029,7 +3029,8 @@ int handler::update_auto_increment()
   enum enum_check_fields save_count_cuted_fields;
   DBUG_ENTER("handler::update_auto_increment");
 
-  if (table->versioned_by_sql())
+  // System Versioning: handle ALTER ADD COLUMN AUTO_INCREMENT
+  if (thd->lex->sql_command == SQLCOM_ALTER_TABLE && table->versioned_by_sql())
   {
     Field *end= table->vers_end_field();
     DBUG_ASSERT(end);