0AyanamiRei opened a new pull request, #55751:
URL: https://github.com/apache/doris/pull/55751

   …nd triggered in RowsetBuilder
   
   ### What problem does this PR solve?
   
   Issue Number: close #xxx
   
   Related PR: #xxx
   
   Problem Summary:
   This PR fixes a bug in `RowsetBuilder::check_tablet_version_count` where the 
TOO_MANY_VERSION error was not triggered due to being masked by the memory 
limit check. 
   
   In the original logic, if the tablet version count did not exceed 
`max_version_config - 100` or the memory usage exceeded the soft limit 
(`GlobalMemoryArbitrator::is_exceed_soft_mem_limit`), the method returned 
`Status::OK()` prematurely, bypassing the version count check against 
max_tablet_version_num. 
   
   This caused the TOO_MANY_VERSION error to be suppressed, leading to 
incorrect behavior in version limit enforcement and failing regression tests 
(e.g., too_many_versions_detection).
   
    The fix reorders the logic to prioritize the version count check, ensuring 
TOO_MANY_VERSION is triggered when version_count > max_tablet_version_num. 
Additionally, a new FETCH_MEMORY_EXCEEDED error is introduced for memory 
shortage cases to improve error clarity.
   
   ### 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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