Au-Miner opened a new pull request, #27898:
URL: https://github.com/apache/flink/pull/27898
## What is the purpose of the change
Fix the default escape character `\` not being applied in LIKE's quick path
when no ESCAPE clause is specified, causing `'TE%ST' LIKE 'TE\%ST'` to
incorrectly return FALSE while `'TE_ST' LIKE 'TE\_ST'` correctly returns TRUE.
## Brief change log
- Unified escape character handling in `LikeCallGen` for both 2-operand
and 3-operand cases using `Option[Char]`
- Added test cases for default escape `\` and empty ESCAPE scenarios in
`ScalarFunctionsTest`
## Verifying this change
This change is verified by new and existing tests in
`ScalarFunctionsTest#testLike` and `ScalarFunctionsTest#testLikeWithEscape`.
## 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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