### What problem does this PR solve?
This PR introduces a UT to prevent unintended changes to the Jsonb
format.
The Jsonb format is a stable data contract and should not be changed
lightly, as it may break backward compatibility or affect persisted
data.
Changes
1. Added a dedicated test case that verifies the binary output of
serialized Jsonb data.
2. The test includes hardcoded reference strings and binary blobs as
golden values to validate serialization output.
3. This ensures any modification to the format will be caught early
during development or code review.
Notes
• Developers should not remove or modify this test without a thorough
review and a strong justification.
• If the serialization format must change, please update the test
accordingly and ensure compatibility is preserved.
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR
should merge into -->
1ae039e4ae