wipheg opened a new pull request, #11401:
URL: https://github.com/apache/seatunnel/pull/11401
### Purpose of this pull request
Closes #11042.
This PR exposes structured CDC source identifiers as stable metadata fields.
It adds `Schema`, `Collection`, and `Namespace` metadata keys and wires them
into the existing CDC metadata projection path.
Connector coverage:
- MySQL-CDC / TiDB-CDC: `Database`, `Table`
- PostgreSQL-CDC / Opengauss-CDC / Oracle-CDC / SQLServer-CDC: `Database`,
`Schema`, `Table`
- MongoDB-CDC: `Database`, `Collection`, `Namespace`
Missing identifiers remain absent instead of being filled with placeholders
or duplicated values.
### Does this PR introduce _any_ user-facing change?
Yes.
CDC users can now project structured source identifiers through the
`Metadata` transform.
Relational CDC example:
```hocon
metadata_fields {
Database = source_database
Schema = source_schema
Table = source_table
}
```
MongoDB-CDC example:
```hocon
metadata_fields {
Database = source_database
Collection = source_collection
Namespace = source_namespace
}
```
The metadata contract and connector coverage matrix are documented in both
English and Chinese docs.
### How was this patch tested?
Added focused tests:
- `MetadataTransformTest`
- `SeaTunnelRowDebeziumDeserializeSchemaTest`
- `MongoDBConnectorDeserializationSchemaTest`
Ran:
```bash
./mvnw spotless:apply
```
```bash
./mvnw -pl
seatunnel-transforms-v2,seatunnel-connectors-v2/connector-cdc/connector-cdc-base,seatunnel-connectors-v2/connector-cdc/connector-cdc-mongodb
"-Dtest=MetadataTransformTest,SeaTunnelRowDebeziumDeserializeSchemaTest,MongoDBConnectorDeserializationSchemaTest"
"-DskipIT" "-DskipE2E" "-DfailIfNoTests=false"
"-Dsurefire.failIfNoSpecifiedTests=false" test
```
Full `./mvnw -q -DskipTests verify` was attempted locally, but it failed in
unrelated existing E2E/JDBC modules.
### Check list
* [ ] 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
* [ ] If necessary, please update `incompatible-changes.md` to describe the
incompatibility caused by this PR.
* [ ] 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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