ozankabak commented on code in PR #6671:
URL: https://github.com/apache/arrow-datafusion/pull/6671#discussion_r1230199201
##########
datafusion/core/src/physical_plan/udaf.rs:
##########
@@ -70,6 +70,11 @@ impl AggregateFunctionExpr {
pub fn fun(&self) -> &AggregateUDF {
&self.fun
}
+
+ /// Returns true if this can support sliding accumulators
+ pub fn retractable(&self) -> Result<bool> {
+ Ok((self.fun.accumulator)(&self.data_type)?.supports_retract_batch())
Review Comment:
Maybe we can fix this and its window function counterpart in a refactor. We
discussed this instantiation thing in a meeting recently and we are not super
happy with it either. Let's get the basics in and then we can work on the rough
edges.
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