waynr commented on code in PR #7160:
URL: https://github.com/apache/arrow-rs/pull/7160#discussion_r1964912513
##########
object_store/src/extensions.rs:
##########
@@ -0,0 +1,257 @@
+use std::{
+ any::{Any, TypeId},
+ collections::HashMap,
+ sync::Arc,
+};
+
+/// Trait that must be implemented by extensions.
+pub trait Extension: std::fmt::Debug + Send + Sync {
Review Comment:
For what it's worth, another use case aside from tracing spans that
@crepererum mentioned to me was passing file size hints via `GetOptions` to a
caching layer to avoid extraneous `HEAD` requests in certain use cases.
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