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Showing content from https://github.com/pandas-dev/pandas/issues/56702 below:

Support large string types in the interchange protocol · Issue #56702 · pandas-dev/pandas · GitHub

• Adding new functionality to pandas

• Changing existing functionality in pandas

• Removing existing functionality in pandas

The interchange protocol supports the large string type. Pandas could also support it, but currently does not. It only supports 'small' strings.

This currently works:

import pandas as pd

df = pd.Series([], name="a", dtype="string[pyarrow]").to_frame()
dfi = df.__dataframe__()
result = pd.api.interchange.from_dataframe(dfi)
# result is equal to df

This does not:

import pandas as pd

df = pd.Series([], name="a", dtype="large_string[pyarrow]").to_frame()
dfi = df.__dataframe__()
result = pd.api.interchange.from_dataframe(dfi)
# ValueError: Data type large_string[pyarrow] not supported by interchange protocol

n/a

@MarcoGorelli FYI. Supporting large string would mean better interop with Polars and pyarrow.

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