可以帮忙解释一下这几个输出是啥意思吗？谢谢~

[eAzure]

for (const Step& step : state->transform_steps) {
if (const SplitStepNode* const split_step = step.as()) {
// if (split_step->lengths.size() == 4) {
LOG(INFO) << "split->iterid:" << split_step->iter_id;
LOG(INFO) << "split_step->lengths.size():"<< split_step->lengths.size();
LOG(INFO) << "extent->value:" << split_step->extent.value();

  int64_t split_length = 1;
  for (const Optional<Integer>& len : split_step->lengths) {
    split_length *= len.value()->value;
    LOG(INFO) << "len.value():" << len.value()->value;
  }
  LOG(INFO)<<"split_length: " << split_length;
  // }
}

}

[eAzure]

I think I know the answer. Thanks!