name:       "date_diff_month_oney",
			query:      `SELECT date_diff(month, '2010T', '2011T') FROM S3Object LIMIT 1`,
			wantResult: `{"_1":12}`,
		},
		{
			name:       "date_diff_month_neg",
			query:      `SELECT date_diff(month, '2011T', '2010T') FROM S3Object LIMIT 1`,
			wantResult: `{"_1":-12}`,
		},
		{
			name:       "date_diff_days",

	ct, err := findColumnType(&DiffType{}, "name")
	if err != nil {
		t.Errorf("findColumnType err:%v", err)
	}

	AssertEqual(t, "varchar", strings.ToLower(ct.DatabaseTypeName()))

	err = DB.Table("diff_types").AutoMigrate(&DiffType1{})
	if err != nil {
		t.Errorf("AutoMigrate err:%v", err)
	}

	ct, err = findColumnType(&DiffType{}, "name")
	if err != nil {
		t.Errorf("findColumnType err:%v", err)