Jefffrey commented on code in PR #9891:
URL: https://github.com/apache/arrow-rs/pull/9891#discussion_r3185824314
##########
arrow-array/src/array/run_array.rs:
##########
@@ -30,6 +30,25 @@ use crate::{
types::{Int16Type, Int32Type, Int64Type, RunEndIndexType},
};
+/// Recursively applies a function to the values of a RunEndEncoded array,
preserving the run structure.
+///
+/// # Example
+///
+/// ```ignore
+/// let result = ree_recurse!(array, Int32Type, my_function)?;
+/// ```
+///
+/// This macro is useful for implementing functions that should work on the
logical values
+/// of a REE array while preserving the run-end encoding structure.
+#[macro_export]
+macro_rules! ree_map {
Review Comment:
What about having a `AnyRunArray` trait like we do for
[`AnyDictionaryArray`](https://docs.rs/arrow/latest/arrow/array/trait.AnyDictionaryArray.html)?
This way users can downcast to `AnyRunArray` instead of needing to cast to
each individual key type which the macro still requires
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