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ARROW-10482: [Python] Fix compression per column in Parquet writing #8580

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ARROW-10482: [Python] Fix compression per column in Parquet writing #8580

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2 changes: 1 addition & 1 deletion python/pyarrow/_parquet.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -1159,7 +1159,7 @@ cdef shared_ptr[WriterProperties] _create_writer_properties(
elif compression is not None:
for column, codec in compression.iteritems():
check_compression_name(codec)
props.compression(column, compression_from_name(codec))
props.compression(tobytes(column), compression_from_name(codec))

if isinstance(compression_level, int):
props.compression_level(compression_level)
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5 changes: 5 additions & 0 deletions python/pyarrow/tests/test_parquet.py
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Expand Up @@ -838,6 +838,11 @@ def test_compression_level(use_legacy_dataset):
compression_level=5,
use_legacy_dataset=use_legacy_dataset)

# Check that the user can provide a compression per column
_check_roundtrip(table, expected=table,
compression={'a': "gzip", 'b': "snappy"},
use_legacy_dataset=use_legacy_dataset)

# Check that the user can provide a compression level per column
_check_roundtrip(table, expected=table, compression="gzip",
compression_level={'a': 2, 'b': 3},
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