findepi commented on code in PR #13756:
URL: https://github.com/apache/datafusion/pull/13756#discussion_r1884576381


##########
datafusion/functions-nested/src/extract.rs:
##########
@@ -993,3 +993,84 @@ where
     let data = mutable.freeze();
     Ok(arrow::array::make_array(data))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::array_element_udf;
+    use arrow_schema::{DataType, Field};
+    use datafusion_common::{Column, DFSchema, ScalarValue};
+    use datafusion_expr::expr::ScalarFunction;
+    use datafusion_expr::{cast, Expr, ExprSchemable};
+    use std::collections::HashMap;
+
+    #[test]
+    fn test_array_element_return_type() {
+        let complex_type = DataType::FixedSizeList(

Review Comment:
   
   
   > Weird, when I remove this line in expr schema the test passes (with 
FixedSizedList):
   
   i did the same, basically removing this block
   
https://github.com/apache/datafusion/blob/b30c2007c2209bca90f2c285a775f09d9a56be03/datafusion/expr/src/expr_schema.rs#L155-L167
   
   it's enough to fix the unit test in this PR
   but other things start to fail
   
   
   
   > It doesn't seem right to me that `ExprSchema` is coercing the arguments 
(implicitly) to me 🤔
   
   agreed
   



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