public Builder mergeIdentity(com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity value) {
        if (identityBuilder_ == null) {
          if (((bitField0_ & 0x00000001) == 0x00000001) &&
              identity_ != com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity.getDefaultInstance()) {
            identity_ =
              com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity.newBuilder(identity_).mergeFrom(value).buildPartial();
          } else {
            identity_ = value;
          }
          onChanged();
        } else {
          identityBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000001;
        return this;
      }
<code>optional .com.alibaba.otter.node.etl.model.protobuf.Identity identity = 1;</code>
node/etl/src/main/java/com/alibaba/otter/node/etl/model/protobuf/BatchProto.java