[jira] [Resolved] (ARROW-7957) [Python] ParquetDataset cannot take HadoopFileSystem as filesystem

["Krisztian Szucs (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-7957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Krisztian Szucs resolved ARROW-7957.
------------------------------------
    Resolution: Fixed

Issue resolved by pull request 8414
[https://github.com/apache/arrow/pull/8414]

> [Python] ParquetDataset cannot take HadoopFileSystem as filesystem
> ------------------------------------------------------------------
>
>                 Key: ARROW-7957
>                 URL: https://issues.apache.org/jira/browse/ARROW-7957
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.16.0
>            Reporter: Catherine
>            Assignee: Joris Van den Bossche
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 2.0.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> {{from pyarrow.fs import HadoopFileSystem}}
>  {{import pyarrow.parquet as pq}}
>  
> {{file_name = "hdfs://localhost:9000/test/file_name.pq"}}
>  {{hdfs, path = HadoopFileSystem.from_uri(file_name)}}
>  {{dataset = pq.ParquetDataset(file_name, filesystem=hdfs)}}
>  
> has error:
>  {{OSError: Unrecognized filesystem: <class 'pyarrow._hdfs.HadoopFileSystem'>}}
>  
> When I tried using the deprecated {{HadoopFileSystem}}:
> {{import pyarrow}}
>  {{import pyarrow.parquet as pq}}
>  
> {{file_name = "hdfs://localhost:9000/test/file_name.pq"}}
> {{hdfs = pyarrow.hdfs.connect('localhost', 9000)}}
> {{dataset = pq.ParquetDataset(file_names, filesystem=hdfs)}}
> {{pa_schema = dataset.schema.to_arrow_schema()}}
> {{pieces = dataset.pieces}}
> {{for piece in pieces: }}
> {{    print(piece.path)}}
>  
> {{piece.path}} lose the {{hdfs://localhost:9000}} prefix.
>  
> I think {{ParquetDataset}} should accept {{pyarrow.fs.}}{{HadoopFileSystem as filesystem?}}
> And {{piece.path}} should have the prefix?



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