cshuo opened a new pull request, #19402:
URL: https://github.com/apache/hudi/pull/19402
### Describe the issue this Pull Request addresses
Closes #19401.
The Flink table-format and source-reader read paths need more focused unit
coverage around partition paths, CDC iteration, schema reconciliation, COW
split planning, and iterator lifecycle behavior.
### Summary and Changelog
- Add unit tests for partition path parsing, construction, validation, and
partition pruning
- Add CDC image-manager and CDC iterator coverage
- Add read-time schema reconciliation and Parquet configuration coverage
- Add COW input split planning coverage
- Add record iterator lifecycle, projection, and exception-path coverage
### Impact
Test-only change. There are no public API, runtime behavior, or performance
changes.
### Risk Level
None.
### Documentation Update
None.
### Test Plan
The following targeted JaCoCo-enabled test run passed with 30 tests and no
failures or errors:
```shell
mvn -Punit-tests -Djacoco.skip=false \
-pl hudi-flink-datasource/hudi-flink -am \
-Dtest=TestFilePathUtils,TestCdcImageManager,TestCdcIterators,TestInternalSchemaManager,TestCopyOnWriteInputFormat,TestRecordIterators
\
-Dsurefire.failIfNoSpecifiedTests=false \
-DskipITs -DskipSparkTests -DskipScalaTests test
```
### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [x] Enough context is provided in the sections above
- [x] Adequate tests were added if applicable
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