[jira] [Created] (ARROW-9780) [Python] Legacy ParquetDataset gives confusing error message when passed a filter for non-directory dataset

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-9780:
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             Summary: [Python] Legacy ParquetDataset gives confusing error message when passed a filter for non-directory dataset
                 Key: ARROW-9780
                 URL: https://issues.apache.org/jira/browse/ARROW-9780
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 1.0.0
            Reporter: Joris Van den Bossche


Not highest priority since it's for the legacy dataset, but this is rather confusing:

{code}
In [2]: pq.ParquetDataset("test.parquet", filters=[("x", ">", 4)])   
...
AttributeError: 'NoneType' object has no attribute 'filter_accepts_partition'
{code}

Basically the filters argument only makes sense for a directory (because the legacy dataset only filters on partitions), but it shouldn't error like that for non-directories.


From https://github.com/dask/dask/issues/6512



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