lyne7-sc opened a new pull request, #23489:
URL: https://github.com/apache/datafusion/pull/23489

   ## Which issue does this PR close?
   
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   - Closes #23081.
   
   ## Rationale for this change
   
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    Why are you proposing this change? If this is already explained clearly in 
the issue then this section is not needed.
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   Following #23275, all `GroupsAccumulator` implementations now provide 
`convert_to_state`.
   
   The `supports_convert_to_state` capability flag is therefore no longer 
needed.
   
   ## What changes are included in this PR?
   
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   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
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   - Make `GroupsAccumulator::convert_to_state` a required trait method.
   - Remove `GroupsAccumulator::supports_convert_to_state` and its 
implementations.
   - Remove the corresponding capability checks from hash aggregation.
   - Simplify skip-partial aggregation to use the required `convert_to_state` 
implementation directly.
   - Add a regression test covering the partial hash aggregation skip path.
   - Document the breaking trait change in the 55.0.0 upgrading guide.
   
   - Remove `FFI_GroupsAccumulator::supports_convert_to_state`. This changes 
the FFI ABI layout, so providers and consumers must be rebuilt against 
DataFusion 55.
   
   ## Are these changes tested?
   
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   Yes. Added a regression test verifying that skip-partial aggregation uses 
the required `convert_to_state` implementation without a capability flag.
   
   Existing physical-plan and FFI tests continue to pass.
   
   ## Are there any user-facing changes?
   
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updated before approving the PR.
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   Yes. This is a breaking Rust API change for external `GroupsAccumulator` 
implementations:
   
   - `convert_to_state` must now be implemented.
   - `supports_convert_to_state` should be removed.
   
   The migration is documented in the 55.0.0 upgrading guide.
   
   The `FFI_GroupsAccumulator` layout has changed. FFI providers and consumers 
must be rebuilt against DataFusion 55 and must not exchange this struct with 
older major versions.
   


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