Caideyipi opened a new pull request, #18324:
URL: https://github.com/apache/iotdb/pull/18324
## Description
### Root cause
Schema snapshot deserialization tracked the current table name only when a
database child was an internal node or a table-device node. In legacy
mixed-model metadata, the table-name node can also be a tree-model device. A
nested table device was therefore restored with a null table name, causing an
NPE in table-device statistics recovery and preventing the DataNode from
starting.
### Fix
- Track the current table name for every direct child of the database root.
- Recover table-device statistics only after that table name has been
updated.
- Add a regression test that snapshots and restores a table device below a
top-level tree-model device.
### Verification
- mvn spotless:apply -pl iotdb-core/datanode
- mvn test -pl iotdb-core/datanode -Dtest=SchemaRegionManagementTest
- 24 tests run, 0 failures, 0 errors, 4 existing performance tests skipped
<hr>
This PR has:
- [x] been self-reviewed.
- [x] added comments explaining the why and intent where it is not obvious.
- [x] added unit tests to cover the new code path.
<hr>
##### Key changed/added classes
- MemMTreeSnapshotUtil
- SchemaRegionManagementTest
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