dylanhz opened a new pull request, #25291:
URL: https://github.com/apache/flink/pull/25291
## What is the purpose of the change
Add the built-in function PERCENTILE.
Examples:
```SQL
> SELECT PERCENTILE(col, 0.3) FROM VALUES (0), (10), (10) AS tab(col);
6.0
> SELECT PERCENTILE(col, 0.3, freq) FROM VALUES (0, 1), (10, 2) AS tab(col,
freq);
6.0
> SELECT PERCENTILE(col, array(0.25, 0.75)) FROM VALUES (0), (10) AS
tab(col);
[2.5,7.5]
```
## Brief change log
- Add `ArgumentTypeStrategy` for percentage (array) value with literal value
checking
- Support validation error test for built-in agg functions
- Support creating `AggregateInfo` through `BuiltInFunctionDefinition`
directly to avoid an extra `SqlAggFunction` conversion
- [FLINK-36123](https://issues.apache.org/jira/browse/FLINK-36123)
## Verifying this change
For the two `ArgumentTypestrategy`: `InputTypeStrategiesTest`
For the `PercentileTypestrategy`: `TypeStrategiesTest`
For the function PERCENTILE:
- `PercentileAggFunctionITCase`,
- `WindowAggregateITCase#testPercentileOnEventTimeTumbleWindow()`
- `sql/AggregateITCase#testSinglePercentile()`,
`sql/AggregateITCase#testMultiPercentile()`
- `table/AggregateITCase#testSinglePercentile()`,
`table/AggregateITCase#testMultiPercentile()`
## 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)`: (yes)
- 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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