eldenmoon opened a new pull request, #65594:
URL: https://github.com/apache/doris/pull/65594

   ### What problem does this PR solve?
   
   Issue Number: N/A
   
   Related PR: #65436
   
   Problem Summary: A top-level NESTED search currently maps matching child 
elements to parent rows but does not aggregate element scores into 
CollectionSimilarity. If score() pushdown is allowed, the parent rows can 
materialize zero scores. Reject top-level NESTED + score() in the FE pushdown 
rule and add a BE guard until nested score aggregation is implemented.
   
   ### Release note
   
   None.
   
   ### Check List (For Author)
   
   - [x] Test: FE unit tests
   - [x] Test: FE build
   - [ ] Test: BE build in progress
   - [x] Behavior changed: unsupported top-level NESTED + score() now returns 
an explicit error
   - [x] Does this need documentation: No
   


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