1fanwang commented on code in PR #51246:
URL: https://github.com/apache/arrow/pull/51246#discussion_r3983409469
##########
python/pyarrow/tests/test_io.py:
##########
@@ -1216,6 +1216,11 @@ def test_memory_map_resize(tmpdir):
assert f.read() == bytes(arr[:SIZE])
+def test_memory_map_resize_uninitialized():
+ with pytest.raises(ValueError, match="I/O operation on closed file"):
+ pa.MemoryMappedFile().resize(0)
+
+
Review Comment:
Keeping it in-process per
https://github.com/apache/arrow/pull/51246#discussion_r3976334026; with the fix
it raises rather than crashing.
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