[PR] Refactor DataNode table update state [iotdb]

["Caideyipi (via GitHub)" <gi...@apache.org>]

Caideyipi opened a new pull request, #18746:
URL: https://github.com/apache/iotdb/pull/18746

   ## Description
   
   - Replace the separate `previousTableMap` with a per-table `TableUpdateState` that keeps the pending schema, fetch version, and rollback snapshot together.
   - Preserve the first before-image across repeated pre-update callbacks.
   - Keep the restart recovery behavior: when the previous schema is unavailable, rollback evicts the untrusted initialized schema and leaves a non-committable marker so the next lookup fetches the canonical ConfigNode schema.
   - Clarify that the ordinary fetch path does not return a table schema while its procedure is running.
   
   This is a follow-up to #18626. It keeps the rollback protection introduced there while removing the consistency burden of maintaining two maps for one table update.
   
   ## Tests
   
   - `mvn spotless:apply -pl iotdb-core/datanode`
   - `mvn test -pl iotdb-core/datanode -Dtest=DataNodeTableCacheTest -DforkCount=0` (9 tests passed)
   


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Re: [PR] Refactor DataNode table update state [iotdb]

["Caideyipi (via GitHub)" <gi...@apache.org>]

Caideyipi closed pull request #18746: Refactor DataNode table update state
URL: https://github.com/apache/iotdb/pull/18746


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