jayzhan211 commented on code in PR #13756:
URL: https://github.com/apache/datafusion/pull/13756#discussion_r1887765061


##########
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:
   > the function arguments should already be of the right coerced type
   I don't think this is true because we allow any data types as function's 
input, and we d the type check or coercion for them.



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