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ENH: Allow read_csv(engine=pyarrow) to return ArrowExtensionArray-backed columns #47866

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ENH: Allow read_csv(engine=pyarrow) to return ArrowExtensionArray-backed columns #47866

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45f96d9
ENH: Allow read_csv(engine=pyarrow) to return ArrowExtensionArray-bac…
mroeschke Jul 26, 2022
62ef870
Merge remote-tracking branch 'upstream/main' into arrow/csv_arrow
mroeschke Jul 27, 2022
a6fffbe
Check if tests besides dtypes fail by going to pyarrow
mroeschke Jul 27, 2022
e5159e7
Revert "Check if tests besides dtypes fail by going to pyarrow"
mroeschke Jul 27, 2022
0eb916c
Merge remote-tracking branch 'upstream/main' into arrow/csv_arrow
mroeschke Jul 28, 2022
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9 changes: 7 additions & 2 deletions pandas/io/parsers/arrow_parser_wrapper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@

from pandas.core.dtypes.inference import is_integer

from pandas.core.arrays.arrow import ArrowExtensionArray
from pandas.core.frame import DataFrame

from pandas.io.parsers.base_parser import ParserBase
Expand Down Expand Up @@ -147,6 +148,10 @@ def read(self) -> DataFrame:
parse_options=pyarrow_csv.ParseOptions(**self.parse_options),
convert_options=pyarrow_csv.ConvertOptions(**self.convert_options),
)

frame = table.to_pandas()
frame = DataFrame(
{
column_name: ArrowExtensionArray(array)
for column_name, array in zip(table.column_names, table.itercolumns())
}
)
return self._finalize_output(frame)