public Builder mergeGrantCoins(JSystemPiqi.grant_coins_request value) {
        if (grantCoinsBuilder_ == null) {
          if (((bitField0_ & 0x00000002) == 0x00000002) &&
              grantCoins_ != JSystemPiqi.grant_coins_request.getDefaultInstance()) {
            grantCoins_ =
              JSystemPiqi.grant_coins_request.newBuilder(grantCoins_).mergeFrom(value).buildPartial();
          } else {
            grantCoins_ = value;
          }
          onChanged();
        } else {
          grantCoinsBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000002;
        return this;
      }