revert changes made in ARROW-11394

See commit 9f96561

Author: nevi-me

arrow/src/array/transform/structure.rs

@@ -26,13 +26,10 @@ pub(super) fn build_extend(array: &ArrayData) -> Extend {
                   index: usize,
                   start: usize,
                   len: usize| {
-                mutable.child_data.iter_mut().for_each(|child| {
-                    child.extend(
-                        index,
-                        array.offset() + start,
-                        array.offset() + start + len,
-                    )
-                })
+                mutable
+                    .child_data
+                    .iter_mut()
+                    .for_each(|child| child.extend(index, start, start + len))
             },
         )
     } else {
@@ -41,7 +38,7 @@ pub(super) fn build_extend(array: &ArrayData) -> Extend {
                   index: usize,
                   start: usize,
                   len: usize| {
-                (array.offset() + start..array.offset() + start + len).for_each(|i| {
+                (start..start + len).for_each(|i| {
                     if array.is_valid(i) {
                         mutable
                             .child_data