wudidapaopao commented on code in PR #25536:
URL: https://github.com/apache/datafusion/pull/25536#discussion_r4126200024
##########
datafusion/expr/src/udaf.rs:
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@@ -311,6 +312,17 @@ impl AggregateUDF {
self.inner.simplify()
}
+ /// Returns this aggregate function's candidate decomposition, if any.
+ ///
+ /// See [`AggregateUDFImpl::decompose`] for more details.
+ pub fn decompose(
Review Comment:
I filed https://github.com/apache/datafusion/issues/25847 to track the
follow-up optimization for avoiding aggregate argument-array materialization in
`COUNT(*)` / provably non-null `COUNT` calls.
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