jorisvandenbossche commented on PR #40482:
URL: https://github.com/apache/arrow/pull/40482#issuecomment-1991631207
One of the problems with the `Flatten` APIs as far as I understand (and that
I am not sure you tackled in the current version of the PR?), is that you would
then also have to change the offsets to keep those matching the flattened
values.
From a comment in `ConvertListsLike`:
```
// We can't use Flatten(), because it removes the values behind a null
list
// value, and that makes the offsets into original list values and our
// flattened_values array different.
```
So that might be a reason to keep something more similar to the logic we
have in arrow_to_pandas.cc right now for ListArray
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