findepi commented on code in PR #16625:
URL: https://github.com/apache/datafusion/pull/16625#discussion_r2217667332
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datafusion/ffi/src/udaf/mod.rs:
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@@ -561,6 +561,7 @@ impl AggregateUDFImpl for ForeignAggregateUDF {
pub enum FFI_AggregateOrderSensitivity {
Insensitive,
HardRequirement,
+ SoftRequirement,
Review Comment:
This new thing doesn't need to be supported in the FFI.
However, i didn't know how to avoid adding this.
When looking at `impl From<AggregateOrderSensitivity> for
FFI_AggregateOrderSensitivity` i am under impression that this particular part
of FFI API is tightly coupled with the datafusion core, so in this particular
place it cannot deliver API stability without inhibiting datafusion core
progress. The necessary solution might be replacing this `From` with `TryFrom`,
same with (`impl From<FFI_AggregateOrderSensitivity> for
AggregateOrderSensitivity)`.
My understanding is that, by tightly coupling `AggregateOrderSensitivity`
and `FFI_AggregateOrderSensitivity` code author chose to let these enums
naturally evolve over time, considering this not a breaking change, or an
acceptable breaking change.
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