rluvaton commented on code in PR #18921:
URL: https://github.com/apache/datafusion/pull/18921#discussion_r3073422413
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datafusion/expr/src/type_coercion/functions.rs:
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@@ -148,6 +151,81 @@ pub fn fields_with_udf<F: UDFCoercionExt>(
.collect())
}
+/// Performs type coercion for higher order function arguments.
+///
+/// For value arguments, returns the field to which each
+/// argument must be coerced to match `signature`.
+/// For lambda arguments, returns a clone of the associated data
+///
+/// For more details on coercion in general, please see the
+/// [`type_coercion`](crate::type_coercion) module.
+pub fn value_fields_with_higher_order_udf<L: Clone>(
Review Comment:
can you please add tests?
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