raminqaf opened a new pull request, #28165:
URL: https://github.com/apache/flink/pull/28165
## What is the purpose of the change
The parser already accepted `ALTER MATERIALIZED TABLE t RESET ('k')`, but
the planner had no converter registered for `SqlAlterMaterializedTableReset`.
As a result, the statement was rejected at plan time with `TableException:
Unsupported query`.
Add `SqlAlterMaterializedTableResetConverter` and register it in
`SqlNodeConverters#registerMaterializedTableConverters`. The converter emits an
`AlterMaterializedTableChangeOperation` with one `TableChange.reset(key)` per
key. Merging is handled by `MaterializedTableChangeHandler.resetTableOption`,
which is a no-op for keys not currently set. Empty key lists and resetting the
`connector` key are rejected, matching the non-materialized-table RESET path.
Planner-level tests cover success (with order-preserving summary string),
empty key list, the `connector` key, unknown table, and applying RESET to a
regular table. A gateway IT test exercises the end-to-end flow in FULL refresh
mode where the change is applied directly to the catalog. The user-facing docs
are updated for the new RESET clause.
## Brief change log
- Add `SqlAlterMaterializedTableResetConverter`
- register the new converter in
`SqlNodeConverters#registerMaterializedTableConverters`
- Planner-level tests
## Verifying this change
- Added test in planner-level under
`SqlMaterializedTableNodeToOperationConverterTest.java`
- Added IT cases in `MaterializedTableStatementITCase.java`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (docs)
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