/* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "my_global.h"
#include <gtest/gtest.h>
#include "test_utils.h"

#include "item_cmpfunc.h"

namespace item_func_case_unittest {

using my_testing::Server_initializer;

class ItemFuncCaseTest : public ::testing::Test
{
protected:
  virtual void SetUp()
  {
    initializer.SetUp();
  }

  virtual void TearDown() { initializer.TearDown(); }

  THD *thd() { return initializer.thd(); }

  Server_initializer initializer;
};

/*
  Bug#21381060 
  A "CASE WHEN" EXPRESSION WITH NULL AND AN UNSIGNED TYPE GIVES A SIGNED RESULT

  Original test case:
    create table MyTable (`n` tinyint unsigned not null);
    insert into MyTable (n) values (180);
    select (case when 1 then n else null end) as value from MyTable;

  The returned value was signed, rather than unsigned.

  This unit test verifies that the bug is fixed in 5.7 and up.
*/
TEST_F(ItemFuncCaseTest, CaseWhenElseNull)
{
  Item_int *int_one= new Item_int(1);
  Item_int *int_n= new Item_int(180ULL);
  List<Item> list;
  list.push_back(int_one);
  list.push_back(int_n);
  Item_func_case *item_case=
    new Item_func_case(POS(), list, NULL, new Item_null());
  EXPECT_FALSE(item_case->fix_fields(thd(), NULL));

  EXPECT_FALSE(int_one->unsigned_flag);
  EXPECT_TRUE(int_n->unsigned_flag);
  EXPECT_EQ(180, item_case->val_int());
  // Result should be unsigned.
  EXPECT_TRUE(item_case->unsigned_flag);
}


}