findepi commented on code in PR #13756:
URL: https://github.com/apache/datafusion/pull/13756#discussion_r1885083552


##########
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:
   in a logical plan, the function arguments should already be of the right 
coerced type, we should just use them.
   they may be not required type on the early plan building phase (when plan is 
still syntactical, not semantical), which unfortuantely uses the same 
`LogicalPlan` and `Expr` types. 
https://github.com/apache/datafusion/issues/12604 would address that.
   
   



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