alamb commented on code in PR #12098:
URL: https://github.com/apache/datafusion/pull/12098#discussion_r1725435478
##########
datafusion/expr/src/udaf.rs:
##########
@@ -442,7 +442,7 @@ pub trait AggregateUDFImpl: Debug + Send + Sync {
/// not implement the method, returns an error. Order insensitive and hard
/// requirement aggregators return `Ok(None)`.
fn with_beneficial_ordering(
- self: Arc<Self>,
+ &self,
Review Comment:
I think the idea is that passing through the `&Arc` allows the result to be
created without a deep copy., though maybe it is being overly optimized 🤔
##########
datafusion/expr/src/udaf.rs:
##########
@@ -608,6 +608,60 @@ impl AggregateUDFImpl for AliasedAggregateUDFImpl {
&self.aliases
}
+ fn state_fields(&self, args: StateFieldsArgs) -> Result<Vec<Field>> {
Review Comment:
👍 nice - to avoid similar bugs in the future maybe we should also add a
comment to `AggregateUDFImpl` that tries to remind people to add an
implementation here.
It would be cool if we could tell Rust not to create a default
implementation for a particular `impl` so the compiler could do the check for
us, but I don't know how to express that in Rust
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