timsaucer commented on code in PR #20449:
URL: https://github.com/apache/datafusion/pull/20449#discussion_r2956020994


##########
datafusion/expr-common/src/accumulator.rs:
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@@ -48,7 +48,7 @@ use std::fmt::Debug;
 /// [`evaluate`]: Self::evaluate
 /// [`merge_batch`]: Self::merge_batch
 /// [window function]: https://en.wikipedia.org/wiki/Window_function_(SQL)
-pub trait Accumulator: Send + Sync + Debug {
+pub trait Accumulator: Send + Sync + Debug + std::any::Any {

Review Comment:
   I left a comment on the other thread but basically I want to remove these as 
we go: https://github.com/apache/datafusion/pull/20812



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