Tom Augspurger

You're probably right about this being related to the compat level though. If we manually do the conversion and print what we get for various compat levels: ```python import cudf_polars.containers...

Phew, this probably does end up in pylibcudf's handling of validity maps on sliced columns like Lawrence guessed. https://github.com/rapidsai/cudf/issues/19159 is a clean issue with a reproducer. I'm not yet sure...

Thanks @davidwendt, I can confirm that https://github.com/rapidsai/cudf/pull/19174 fixes both https://github.com/rapidsai/cudf/issues/19159 and this issue.

Yes, thanks. We don't yet have explicit test coverage for this in cudf-polars, but that'll come as part of https://github.com/rapidsai/cudf/pull/19146 so I think we're good here.

FYI @rjzamora this will have some overlap with https://github.com/rapidsai/cudf/pull/19130. Any new keys we add to `state` will need a field in `CachingVisitorState`.

Hmm, failing on 3.10: https://github.com/rapidsai/cudf/actions/runs/15594634303/job/43923137155?pr=19135#step:10:7551 ``` │ │ TypeError: cannot inherit from both a TypedDict type and a non-TypedDict base class ``` This might need to wait until we drop...

Just seeing if CI passes with `TypedDict` from typing_extensions. The docs say this should work. If it does, we can discuss adding that as a dependency for python=3.10. Maybe not...

I'd like to add a dependency on `typing-extensions` for just python 3.10. For 3.11 and newer, we don't need typing-extensions. Here's what I think is the desired output: ```diff diff...

Oh, I hadn't considered embedding the marker I want (`python_version < '3.11`) inside the `depedencies.yaml`. That seems to work nicely, thanks.

@gforsyth when you get a chance can you verify that https://github.com/rapidsai/cudf/pull/19135/commits/2077154e5e2827c7db624022597b6be30f7a6888 looks right for the rattler-build side of things? Based on https://rattler.build/latest/selectors/#available-variables it looks OK, but I haven't used rattler-build...