Au-Miner opened a new pull request, #27920:
URL: https://github.com/apache/flink/pull/27920
## What is the purpose of the change
Remove the default escape character \ in LIKE when no ESCAPE clause is
specified. Since Flink's string literal also does not support backslashes, the
default escape character causes confusion.
## Brief change log
- Removed default escape \ in LikeCallGen, unified escape handling for
2-operand and 3-operand cases using Option[Char]
- Added test cases for no-default-escape and explicit ESCAPE scenarios in
ScalarFunctionsTest
## Verifying this change
This change is verified by FlinkSqlLikeUtilsTest.java and
ScalarFunctionsTest.scala (#testLike / #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)`: 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? not applicable
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