ENH (string dtype): convert string_view columns to future string dtype instead of object dtype in Parquet/Feather IO

[jorisvandenbossche]

This is a follow-up on #60222, which allows passing string_view data to the string dtype constructor, but in this PR ensuring we also use this capability when reading Parquet (or Feather, ORC) files that might use that type.

PyArrow does not yet support writing string_view to Parquet, so we can't test it yet with Parquet, only with Feather.

[mroeschke]

Thanks @jorisvandenbossche

[lumberbot-app]

Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

git checkout 2.3.x
git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

git cherry-pick -x -m1 f307a0a3615d93c2177f6581133bdb541e12a93c

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

git commit -am 'Backport PR #60235: ENH (string dtype): convert string_view columns to future string dtype instead of object dtype in Parquet/Feather IO'

4. Push to a named branch:

git push YOURFORK 2.3.x:auto-backport-of-pr-60235-on-2.3.x

5. Create a PR against branch 2.3.x, I would have named this PR:

"Backport PR #60235 on branch 2.3.x (ENH (string dtype): convert string_view columns to future string dtype instead of object dtype in Parquet/Feather IO)"

And apply the correct labels and milestones.

Congratulations — you did some good work! Hopefully your backport PR will be tested by the continuous integration and merged soon!

Remember to remove the Still Needs Manual Backport label once the PR gets merged.

If these instructions are inaccurate, feel free to suggest an improvement.

[jorisvandenbossche]

Manual backport -> #60291