Mryange opened a new pull request, #63810:
URL: https://github.com/apache/doris/pull/63810

   ### What problem does this PR solve?
   
   Problem Summary:
   
   The mixed const execution probe exposed several constant-handling problems 
in BE vectorized functions.
   
   - ColumnConst::clone_resized reused the original nested column, so cloned 
const columns could still alias the source data.
   - quantile_percent requires its percentile argument to stay constant, but 
the all-const probe path unpacked it and triggered a false constant-check 
failure.
   - regexp_count accessed string columns directly and did not handle mixed 
const inputs correctly.
   - uniform still went through the default constant implementation even though 
its result depends on per-row seed values.
   
   This change fixes those behaviors and adds focused unit tests for the 
uncovered cases.
   
   ### 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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