Jefffrey commented on code in PR #18100:
URL: https://github.com/apache/datafusion/pull/18100#discussion_r2458226290


##########
datafusion/ffi/src/udaf/accumulator_args.rs:
##########
@@ -97,6 +97,7 @@ impl TryFrom<AccumulatorArgs<'_>> for FFI_AccumulatorArgs {
 pub struct ForeignAccumulatorArgs {
     pub return_field: FieldRef,
     pub schema: Schema,
+    pub expr_fields: Vec<FieldRef>,

Review Comment:
   I don't _think_ so, since `FFI_AccumulatorArgs` seems to be the one marked 
as being stable across FFI boundaries:
   
   
https://github.com/apache/datafusion/blob/9f23680eb4c72905bb175df9ff01f00c1821e1c4/datafusion/ffi/src/udaf/accumulator_args.rs#L44-L56
   
   Though I am not familiar with the FFI related code.



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