alterColumn = true
				}
			}
		}
	}

	// check precision
	if realDataType == "decimal" || realDataType == "numeric" &&
		regexp.MustCompile(realDataType+`\(.*\)`).FindString(fullDataType) != "" { // if realDataType has no precision,ignore
		precision, scale, ok := columnType.DecimalSize()
		if ok {
			if !strings.HasPrefix(fullDataType, fmt.Sprintf("%s(%d,%d)", realDataType, precision, scale)) &&