smiklos commented on code in PR #7002:
URL: https://github.com/apache/arrow-datafusion/pull/7002#discussion_r1266551095


##########
datafusion/core/src/physical_plan/unnest.rs:
##########
@@ -425,11 +435,16 @@ where
 /// ```ignore
 /// 1, null, 2, 3, 4, null, 5, 6
 /// ```
-fn unnest_array<T>(list_array: &T) -> Result<Arc<dyn Array + 'static>>
+fn unnest_array<T, P>(
+    list_array: &T,
+    list_array_values: &Arc<dyn Array>,
+    list_lengths: &PrimitiveArray<P>,
+) -> Result<Arc<dyn Array + 'static>>
 where
     T: ArrayAccessor<Item = ArrayRef>,
+    P: ArrowPrimitiveType,
 {
-    let elem_type = match list_array.data_type() {
+    let _elem_type = match list_array.data_type() {

Review Comment:
   it does some validation but perhaps it's checked already before the exec 
runs?



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