@java.lang.Override
    public int getSerializedSize() {
        int size = memoizedSize;
        if (size != -1) {
            return size;
        }

        size = 0;
        for (UserRelationshipGroup userRelationshipGroup : userRelationshipGroups_) {
            size += com.google.protobuf.CodedOutputStream.computeMessageSize(1,
                    userRelationshipGroup);
        }
        if (((bitField0_ & 0x00000001) != 0)) {
            size += com.google.protobuf.CodedOutputStream.computeInt64Size(2, lastUpdatedDate_);
        }
        size += getUnknownFields().getSerializedSize();
        memoizedSize = size;
        return size;
    }
<code>optional int64 last_updated_date = 2;</code>

@return The lastUpdatedDate.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/user/UserRelationshipGroupsWithVersion.java