[jira] [Created] (ARROW-9814) [Python] Crash in test_parquet.py::test_read_partitioned_directory_s3fs

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-9814:
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             Summary: [Python] Crash in test_parquet.py::test_read_partitioned_directory_s3fs
                 Key: ARROW-9814
                 URL: https://issues.apache.org/jira/browse/ARROW-9814
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Python
            Reporter: Antoine Pitrou


This seems to happen with some Minio versions, but is definitely a problem in Arrow.
The crash message says:
{code}
pyarrow/tests/test_parquet.py::test_read_partitioned_directory_s3fs[False] ../src/arrow/dataset/discovery.cc:188:  Check failed: relative.has_value() GetFileInfo() yielded path outside selector.base_dir
{code}

The underlying problem is that we pass a full URI for the selector base_dir (such as "s3://bucket/path.") and the S3 filesystem implementation then returns regular paths (such as "bucket/path/foo/bar").

I think we should do two things:
1) error out rather than crash (and include the path strings in the error message), which would be more user-friendly
2) fix the issue that full URIs are passed in base_dir



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