cytq-123 opened a new pull request, #28945: URL: https://github.com/apache/flink/pull/28945
## What is the purpose of the change This PR adds the `ARRAY_FLATTEN` function to Flink SQL, which flattens a nested array by one level. ## Brief change log - Add `ARRAY_FLATTEN` function definition in `BuiltInFunctionDefinitions` - Implement `ArrayFlattenFunction` runtime class - Add type inference strategy in `SpecificTypeStrategies` - Add comprehensive test cases in `CollectionFunctionsITCase` ## Verifying this change This change added tests and can be verified as follows: - Added 10 test cases in `CollectionFunctionsITCase#arrayFlattenTestCases()` - Tests cover basic functionality, NULL handling, and edge cases ## Does this pull request potentially affect one of the following parts: - Dependencies: **no** - The public API: **no** - The serializers: **no** - The runtime per-record code paths: **no** - Anything that affects deployment or recovery: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **yes** - If yes, how is the feature documented? **JavaDocs** -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
