Au-Miner opened a new pull request, #28264:
URL: https://github.com/apache/flink/pull/28264
## What is the purpose of the change
Fix the SQL `SPLIT` function so that, when called with an empty delimiter,
it preserves Supplementary Multilingual Plane characters (e.g. emoji) as single
elements instead of breaking surrogate pairs into invalid "?" placeholders.
## Brief change log
- Change the empty-delimiter branch in `SplitFunction#eval` to iterate by
Unicode code points (`codePointAt` + `Character.charCount`) instead of by
UTF-16 code units, so surrogate-pair characters are emitted as one element.
## Verifying this change
Added a new test case in `CollectionFunctionsITCase#splitTestCases` that
asserts `SPLIT('123😊笑脸', '')` returns `["1", "2", "3", "😊", "笑", "脸"]`,
covering the SMP character path across both Table API and SQL.
## 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? no
- If yes, how is the feature documented? not applicable
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