public Builder clearIdentity() {
        if (identityBuilder_ == null) {
          identity_ = com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity.getDefaultInstance();
          onChanged();
        } else {
          identityBuilder_.clear();
        }
        bitField0_ = (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