private com.google.protobuf.SingleFieldBuilder<
          com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity, com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity.Builder, com.alibaba.otter.node.etl.model.protobuf.BatchProto.IdentityOrBuilder> 
          getIdentityFieldBuilder() {
        if (identityBuilder_ == null) {
          identityBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity, com.alibaba.otter.node.etl.model.protobuf.BatchProto.Identity.Builder, com.alibaba.otter.node.etl.model.protobuf.BatchProto.IdentityOrBuilder>(
                  getIdentity(),
                  getParentForChildren(),
                  isClean());
          identity_ = null;
        }
        return identityBuilder_;
      }
<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