@Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (hasName()) {
        hash = (37 * hash) + NAME_FIELD_NUMBER;
        hash = (53 * hash) + getName().hashCode();
      }
      if (hasId()) {
        hash = (37 * hash) + ID_FIELD_NUMBER;
        hash = (53 * hash) + getId();
      }
      if (hasEmail()) {
        hash = (37 * hash) + EMAIL_FIELD_NUMBER;
        hash = (53 * hash) + getEmail().hashCode();
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }
<code>optional string email = 3;</code>
@return The bytes for email.
core/src/test/java/com/alibaba/fastjson2/protobuf/PersonOuterClass.java