var (
		alterColumn bool
		isSameType  = fullDataType == realDataType
	)

	if !field.PrimaryKey {
		// check type
		if !strings.HasPrefix(fullDataType, realDataType) {
			// check type aliases
			aliases := m.DB.Migrator().GetTypeAliases(realDataType)
			for _, alias := range aliases {
				if strings.HasPrefix(fullDataType, alias) {
					isSameType = true
					break
				}
			}

		if testCase.expectedErrType == nil && err != nil {
			t.Errorf("Test %d, unexpected err is received: %v, expected:%v\n", i+1, err, testCase.expectedErrType)
		}
		if testCase.expectedErrType != nil && !isSameType(err, testCase.expectedErrType) {
			t.Errorf("Test %d, unexpected err is received: %v, expected:%v\n", i+1, err, testCase.expectedErrType)
		}
	}
}