morningman opened a new pull request, #44172:
URL: https://github.com/apache/doris/pull/44172

   ### What problem does this PR solve?
   
   Related PR: #41789
   
   Problem Summary:
   
   This PR #41789 change the local shuffle logic, but forget to implement 
`numScanBackends()`
   in FileQueryScanNode, which causing `select count(*) from hive_table` query 
performance fallback.
   
   This PR implement this method in `FileQueryScanNode()`
   
   ### Release note
   
   None
   
   ### Check List (For Author)
   
   - Test <!-- At least one of them must be included. -->
       - [ ] Regression test
       - [ ] Unit Test
       - [x] Manual test (the daily performance test covered this case)
       - [ ] 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:
       - [x] No.
       - [ ] Yes. <!-- Explain the behavior change -->
   
   - Does this need documentation?
       - [x] 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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