hutiefang76 opened a new pull request, #4406:
URL: https://github.com/apache/amoro/pull/4406

   ## Why are the changes needed?
   
   Fix #4405.
   
   The snapshot descriptor reports total file count and total records, but 
calculates file size as added bytes plus removed bytes. After appending a 
200-byte file to a table containing a 100-byte file, it reports 200 bytes 
rather than 300. Deleting the 100-byte file then reports 100 bytes rather than 
the remaining 200. Reading the total size would make these statistics 
consistent with one another and with the other format descriptors.
   
   ## Brief change log
   
   Read `SnapshotSummary.TOTAL_FILE_SIZE_PROP` for snapshot file size. Add 
append, delete and empty-table regression tests using a temporary Iceberg table.
   
   ## How was this patch tested?
   
   - [x] Add regression tests covering the changed behavior.
   - [x] Run tests locally before making a pull request.
   
   The new suite has 3 tests. On the original implementation, the append and 
delete assertions fail; with the change all 3 pass.
   
   ```shell
   ./mvnw -B -ntp -Pjava11,skip-dashboard-build -pl amoro-ams -am 
-Dsurefire.failIfNoSpecifiedTests=false 
-Dtest=TestSnapshotFileSize,TestIcebergServerTableDescriptor test
   ```
   
   The selected suites passed on Java 11 and Java 17: 13 tests per JDK, with no 
failures, errors or skips. The Java 17 run used a clean build and the `java17` 
profile. Spotless and Checkstyle checks passed. The full test suite and browser 
tests were not run.
   
   ## Documentation
   
   - Does this pull request introduce a new feature? no
   - How is the feature documented? not applicable
   
   Code was assisted by DeepSeek v4 Flash via Reasonix 1.39.4; submission text 
was assisted by Codex. The patch and local test results were reviewed.
   


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