QuakeWang opened a new pull request, #11156:
URL: https://github.com/apache/seatunnel/pull/11156
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### Purpose of this pull request
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request adds checkstyle plugin.-->
Doris sink applied schema changes while the current Stream Load could still
contain rows serialized with the old schema. Those rows could then be committed
after the target table had already been altered, mixing old-schema and
new-schema data in the same load. This is unsafe for positional formats such as
CSV and for schema changes such as drop or rename columns.
This PR flushes the in-flight Stream Load before applying schema changes in
non-2PC mode, then opens a fresh load for rows written with the new schema.
The 2PC path is intentionally unchanged because Doris 2PC currently uses one
transaction and label per checkpoint. Flushing in the middle of a checkpoint
would risk an orphan pre-commit transaction or checkpoint label reuse.
### Does this PR introduce _any_ user-facing change?
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Yes.
For Doris sink with `sink.enable-2pc = false`, buffered rows are now flushed
before schema changes are applied. This prevents old-schema rows from being
committed against the altered table.
The schema evolution documentation now also clarifies the limitation of
Doris schema evolution with `sink.enable-2pc = true`.
### How was this patch tested?
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Added unit tests for:
- non-2PC schema-change ordering: `stopLoad -> apply DDL -> startLoad`
- 2PC behavior: schema changes do not flush in the middle of a checkpoint
Verified with:
```bash
./mvnw spotless:apply
./mvnw -pl seatunnel-connectors-v2/connector-doris
-Dtest=DorisSinkWriterTest test
./mvnw -q -DskipTests verify
```
### Check list
* [x] If any new Jar binary package adding in your PR, please add License
Notice according
[New License
Guide](https://github.com/apache/seatunnel/blob/dev/docs/en/developer/new-license.md)
* [x] If necessary, please update the documentation to describe the new
feature. https://github.com/apache/seatunnel/tree/dev/docs
* [x] If necessary, please update `incompatible-changes.md` to describe the
incompatibility caused by this PR.
* [x] If you are contributing the connector code, please check that the
following files are updated:
1. Update
[plugin-mapping.properties](https://github.com/apache/seatunnel/blob/dev/plugin-mapping.properties)
and add new connector information in it
2. Update the pom file of
[seatunnel-dist](https://github.com/apache/seatunnel/blob/dev/seatunnel-dist/pom.xml)
3. Add ci label in
[label-scope-conf](https://github.com/apache/seatunnel/blob/dev/.github/workflows/labeler/label-scope-conf.yml)
4. Add e2e testcase in
[seatunnel-e2e](https://github.com/apache/seatunnel/tree/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/)
5. Update connector
[plugin_config](https://github.com/apache/seatunnel/blob/dev/config/plugin_config)
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