yzeng1618 opened a new pull request, #10321:
URL: https://github.com/apache/seatunnel/pull/10321
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### Purpose of this pull request
Fix FieldRename so replacements_with_regex works as regex by default when
is_regex is omitted. Previously is_regex=null was treated as “not regex”, so
regex patterns (e.g. lookarounds used for camelCase→snake_case) never applied,
leading to unexpected no-op renames and downstream schema/key mismatches
(reported in https://github.com/apache/seatunnel/issues/10317).
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### Does this PR introduce _any_ user-facing change?
Yes.
- Before: if replacements_with_regex items omit is_regex, the rule is
treated as a literal full-match, so regex patterns don’t take effect.
- After: is_regex defaults to true, so omitted is_regex will apply regex
matching.
- To keep the old literal behavior, users can explicitly set is_regex =
false.
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### How was this patch tested?
- Added unit tests in FieldRenameTransformTest.java.
- Added an e2e regression job config field_rename_regex_default.conf and
executed via TestRenameIT.
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### Check list
* [ ] If any new Jar binary package adding in your PR, please add License
Notice according
[New License
Guide](https://github.com/apache/seatunnel/blob/dev/docs/en/contribution/new-license.md)
* [ * ] If necessary, please update the documentation to describe the new
feature. https://github.com/apache/seatunnel/tree/dev/docs
* [ ] If necessary, please update `incompatible-changes.md` to describe the
incompatibility caused by this PR.
* [ ] If you are contributing the connector code, please check that the
following files are updated:
1. Update
[plugin-mapping.properties](https://github.com/apache/seatunnel/blob/dev/plugin-mapping.properties)
and add new connector information in it
2. Update the pom file of
[seatunnel-dist](https://github.com/apache/seatunnel/blob/dev/seatunnel-dist/pom.xml)
3. Add ci label in
[label-scope-conf](https://github.com/apache/seatunnel/blob/dev/.github/workflows/labeler/label-scope-conf.yml)
4. Add e2e testcase in
[seatunnel-e2e](https://github.com/apache/seatunnel/tree/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/)
5. Update connector
[plugin_config](https://github.com/apache/seatunnel/blob/dev/config/plugin_config)
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