hequn8128 opened a new pull request #8771: [FLINK-12778][table] Fix derive row type bug for table aggregate URL: https://github.com/apache/flink/pull/8771 ## What is the purpose of the change This pull request fix derives row type bug for table aggregate. Currently, we call `aggCalls.get(0).type.getFieldList.foreach(builder.add)` when derive row type for table aggregate. However, for types which are not composite types, the field list would be null. Table Aggregate should, of course, support non-composite types. To solve the problem, we should judge whether types are structured. This is because a composite type will be converted to a RelDataType which contains field list and is structured. ## Brief change log - Fix `deriveTableAggRowType` method in `CommonTableAggregate`. When deriving row type, judge whether the result type of the table aggregate function is structured. Use `FieldInfoUtils.getFieldNames()` to get the field name when the result type is not structured. - In `AggregateOperationFactory.createAggregate()`, also use `FieldInfoUtils.getFieldNames()` to get the field name. - Add tests to verify the results. ## Verifying this change This change added tests and can be verified as follows: - Add plan test for table aggregate(both for window and non-window table aggregate). ## 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, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no)
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