AlenkaF commented on code in PR #13629:
URL: https://github.com/apache/arrow/pull/13629#discussion_r923074731
##########
python/pyarrow/tests/parquet/test_metadata.py:
##########
@@ -531,3 +532,19 @@ def test_metadata_exceeds_message_size():
buf = out.getvalue()
metadata = pq.read_metadata(pa.BufferReader(buf))
+
+
+def test_metadata_schema_filesystem(tmpdir):
+ table = pa.table({"a": [1, 2, 3]})
+
+ # URI writing to local file.
+ file_path = 'file:///' + os.path.join(str(tmpdir), "data.parquet")
+
+ pq.write_table(table, file_path)
+
+ # Get expected `metadata` from path.
+ metadata = pq.read_metadata(tmpdir / '/data.parquet')
Review Comment:
Running this locally I can confirm a segfault. I think it happens because
the table metadata is (correctly) empty:
```python
>>> import pyarrow as pa
>>> import pyarrow.parquet as pq
>>> table = pa.table({"a": [1, 2, 3]})
>>> file_path = "/tmp/data.parquet"
>>> metadata = table.schema.metadata
>>> pq.read_metadata(file_path).equals(metadata)
zsh: segmentation fault python
```
Which would deserve an issue (a warning should be returned without a crash).
Maybe a better option to test ParquetFile metadata would be to inspect
individual attributes:
```python
>>> pq.read_metadata(file_path).num_columns == 1
True
>>> pq.read_metadata(file_path).num_rows == 3
True
```
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