Joris Van den Bossche created ARROW-8213:
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Summary: [Python][Dataste] Opening a dataset with a local
incorrect path gives confusing error message
Key: ARROW-8213
URL: https://issues.apache.org/jira/browse/ARROW-8213
Project: Apache Arrow
Issue Type: Bug
Components: Python
Reporter: Joris Van den Bossche
Fix For: 0.17.0
Even after the previous PRs related to local paths
(https://github.com/apache/arrow/pull/6643,
https://github.com/apache/arrow/pull/6655), I don't the user experience optimal
in case you are working with local files, and pass a wrong, non-existent path
(eg due to a typo).
Currently, you get this error:
{code}
>>> dataset = ds.dataset("data_with_typo.parquet", format="parquet")
...
ArrowInvalid: URI has empty scheme: 'data_with_typo.parquet'
{code}
where "URI has empty scheme" is rather confusing for the user in case of a
non-existent path. I think ideally we should raise a "No such file or
directory" error.
I am not fully sure what the best solution is, as {{FileSystem.from_uri}} can
also give other errors that we do want to propagate to the user.
The most straightforward that I am now thinking of is checking if "URI has
empty scheme" is in the error message, and then rewording it, but that's not
very clean ..
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