diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result
index bfde408343e..45dca86f5f7 100644
--- a/mysql-test/r/group_by.result
+++ b/mysql-test/r/group_by.result
@@ -751,13 +751,6 @@ COUNT(DISTINCT(t1.id))	comment
 1	NULL
 1	a problem
 DROP TABLE t1, t2;
-create table t1 (f1 date);
-insert into t1 values('2005-06-06');
-insert into t1 values('2005-06-06');
-select date(left(f1+0,8)) from t1 group by 1;
-date(left(f1+0,8))
-2005-06-06
-drop table t1;
 create table t1(f1 varchar(5) key);
 insert into t1 values (1),(2);
 select sql_buffer_result max(f1) is null from t1;
@@ -767,6 +760,13 @@ select sql_buffer_result max(f1)+1 from t1;
 max(f1)+1
 3
 drop table t1;
+create table t1 (f1 date);
+insert into t1 values('2005-06-06');
+insert into t1 values('2005-06-06');
+select date(left(f1+0,8)) from t1 group by 1;
+date(left(f1+0,8))
+2005-06-06
+drop table t1;
 CREATE TABLE t1 (n int);
 INSERT INTO t1 VALUES (1);
 SELECT n+1 AS n FROM t1 GROUP BY n;
diff --git a/mysql-test/r/olap.result b/mysql-test/r/olap.result
index 73dd3fc8aa2..df0ee09ea8e 100644
--- a/mysql-test/r/olap.result
+++ b/mysql-test/r/olap.result
@@ -579,6 +579,7 @@ a	LENGTH(a)	COUNT(*)
 1	1	1
 2	1	1
 NULL	NULL	2
+DROP TABLE t1;
 CREATE TABLE t1(id int, type char(1));
 INSERT INTO t1 VALUES
 (1,"A"),(2,"C"),(3,"A"),(4,"A"),(5,"B"),
diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test
index 4631fad3352..29ffa20024f 100644
--- a/mysql-test/t/group_by.test
+++ b/mysql-test/t/group_by.test
@@ -575,6 +575,12 @@ CREATE TABLE t1 (id varchar(20) NOT NULL);
 INSERT INTO t1 VALUES ('trans1'), ('trans2');
 CREATE TABLE t2 (id varchar(20) NOT NULL, err_comment blob NOT NULL);
 INSERT INTO t2 VALUES ('trans1', 'a problem');
+
+SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
+  FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
+
+DROP TABLE t1, t2;
+
 #
 # BUG#12695: Item_func_isnull::update_used_tables
 # did not update const_item_cache
@@ -585,12 +591,6 @@ select sql_buffer_result max(f1) is null from t1;
 select sql_buffer_result max(f1)+1 from t1;
 drop table t1;
 
-SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
-  FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
-
-DROP TABLE t1, t2;
-
-
 #
 # Bug #12266 GROUP BY expression on DATE column produces result with
 #            reduced length
@@ -612,6 +612,16 @@ SELECT n+1 AS n FROM t1 GROUP BY n;
 --enable_ps_protocol
 DROP TABLE t1;
 
+#
+# BUG#12695: Item_func_isnull::update_used_tables
+# did not update const_item_cache
+#
+create table t1(f1 varchar(5) key);
+insert into t1 values (1),(2);
+select sql_buffer_result max(f1) is null from t1;
+select sql_buffer_result max(f1)+1 from t1;
+drop table t1;
+
 # End of 4.1 tests
 
 #
diff --git a/sql/handler.cc b/sql/handler.cc
index cf1fbfec465..3acca812a13 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -570,12 +570,20 @@ int ha_prepare(THD *thd)
     {
       int err;
       statistic_increment(thd->status_var.ha_prepare_count,&LOCK_status);
-      if ((err= (*(*ht)->prepare)(thd, all)))
+      if ((*ht)->prepare)
       {
-        my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
-        ha_rollback_trans(thd, all);
-        error=1;
-        break;
+        if ((err= (*(*ht)->prepare)(thd, all)))
+        {
+          my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
+          ha_rollback_trans(thd, all);
+          error=1;
+          break;
+        }
+      }
+      else
+      {
+        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                            ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), (*ht)->name);
       }
     }
   }