public Builder mergeFrom(JSystemPiqi.system_request other) {
        if (other == JSystemPiqi.system_request.getDefaultInstance()) return this;
        if (other.hasBuyItem()) {
          mergeBuyItem(other.getBuyItem());
        }
        if (other.hasGrantCoins()) {
          mergeGrantCoins(other.getGrantCoins());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }