jackwener opened a new pull request, #27535:
URL: https://github.com/apache/doris/pull/27535
## Proposed changes
```
topn
-> Union All
-> child plan1
-> child plan2
-> child plan3
rewritten to
-> Union All
-> topn
-> child plan1
-> topn
-> child plan2
-> topn
-> child plan3
```
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