seawinde opened a new pull request, #61898:
URL: https://github.com/apache/doris/pull/61898
### What problem does this PR solve?
Issue Number: close #xxx
Problem Summary:
After upgrading from 4.0.2 to 4.0.4, executing `SHOW CREATE MATERIALIZED
VIEW` throws NullPointerException because `MTMV.getSessionVariables()` returns
null for materialized views created before the `sessionVariables` field was
introduced.
The `sessionVariables` field (annotated with `@SerializedName("sv")`) was
added after 4.0.2. MTMVs created in 4.0.2 do not have this field persisted, so
after upgrade it deserializes as null. The code in
`ShowCreateMTMVInfo.getShowResultSet()` called
`mtmv.getSessionVariables().toString()` without null protection.
Fix: Add null check - when sessionVariables is null, display empty map `{}`.
### Release note
Fix NPE when executing SHOW CREATE MATERIALIZED VIEW for materialized views
created before the sessionVariables feature was introduced (e.g. upgrade from
4.0.2 to 4.0.4).
### Check List (For Author)
- Test: Unit Test
- Behavior changed: No
- Does this need documentation: No
### What problem does this PR solve?
Issue Number: #58031
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 -->
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