private void ensureRowsIsMutable() {
        if (!((bitField0_ & 0x00000002) == 0x00000002)) {
          rows_ = new java.util.ArrayList<com.alibaba.otter.node.etl.model.protobuf.BatchProto.RowData>(rows_);
          bitField0_ |= 0x00000002;
         }
      }
<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