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ARROW-3762: [Python] Add large_memory unit test exercising BYTE_ARRAY overflow edge cases from ARROW-3762 #5312

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ARROW-3762: [Python] Add large_memory unit test exercising BYTE_ARRAY overflow edge cases from ARROW-3762 #5312

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22 changes: 20 additions & 2 deletions python/pyarrow/tests/test_parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2445,13 +2445,31 @@ def test_large_table_int32_overflow():
_write_table(table, f)


def _simple_table_roundtrip(table):
def _simple_table_roundtrip(table, **write_kwargs):
stream = pa.BufferOutputStream()
_write_table(table, stream)
_write_table(table, stream, **write_kwargs)
buf = stream.getvalue()
return _read_table(buf)


@pytest.mark.large_memory
def test_byte_array_exactly_2gb():
# Test edge case reported in ARROW-3762
val = b'x' * (1 << 10)

base = pa.array([val] * ((1 << 21) - 1))
cases = [
[b'x' * 1023], # 2^31 - 1
[b'x' * 1024], # 2^31
[b'x' * 1025] # 2^31 + 1
]
for case in cases:
values = pa.chunked_array([base, pa.array(case)])
t = pa.table([values], names=['f0'])
result = _simple_table_roundtrip(t, use_dictionary=False)
assert t.equals(result)


@pytest.mark.pandas
@pytest.mark.large_memory
def test_binary_array_overflow_to_chunked():
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