[Bug] 导出tsfile总是出现内存不足的问题

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version


Cannot dump result because: 301: There is not enough memory to execute current fragment instance, current remaining free memory is 44350172B, estimated memory usage for current fragment instance is 848419096B

内存是足够的, 是不是要修改什么配置的, 2c8g的机器

### Describe the bug and provide the minimal reproduce step

1

### What did you expect to see?

1

### What did you see instead?

1

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

No source file, test, version, or reproducible export command is identified. Start by confirming the IoTDB version and export-to-tsfile path on the reported 2c8g machine, then trace the reported fragment-instance memory check; done means the minimal reproduction exports successfully without the out-of-memory error.

Written by the indexing model from the issue text.