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Showing content from https://github.com/pandas-dev/pandas/issues/55833 below:

Index.get_indexer will change behaviour for nulls with arrow strings · Issue #55833 · pandas-dev/pandas · GitHub

Pandas version checks

I have checked that this issue has not already been reported.
I have confirmed this bug exists on the latest version of pandas.
I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

idx = pd.Index(["a", "b", None], dtype="string[pyarrow_numpy]")
idx.get_indexer([None])

Issue Description

This returns -1 for the new arrow string dtype because we cast None to np.nan when creating the array. We wanted to be as close to object dtype as possible, but patching this does not seem ideal. Thoughts?

cc @jorisvandenbossche

Expected Behavior

see above

Installed Versions

Replace this line with the output of pd.show_versions()

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