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https://issues.apache.org/jira/browse/ARROW-8201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche resolved ARROW-8201.
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Fix Version/s: 10.0.0
Resolution: Fixed
Issue resolved by pull request 14301
[https://github.com/apache/arrow/pull/14301]
> [Python][Dataset] Improve ergonomics of FileFragment
> ----------------------------------------------------
>
> Key: ARROW-8201
> URL: https://issues.apache.org/jira/browse/ARROW-8201
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Python
> Affects Versions: 0.16.0
> Reporter: Ben Kietzman
> Assignee: Miles Granger
> Priority: Major
> Labels: dataset, pull-request-available
> Fix For: 10.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> FileFragment can be made more directly useful by adding convenience methods.
> For example, a FileFragment could allow underlying file/buffer to be opened
> directly:
> {code}
> def open(self):
> """
> Open a NativeFile of the buffer or file viewed by this fragment.
> """
> cdef:
> CFileSystem* c_filesystem
> shared_ptr[CRandomAccessFile] opened
> NativeFile out = NativeFile()
> buf = self.buffer
> if buf is not None:
> return pa.io.BufferReader(buf)
> with nogil:
> c_filesystem = self.file_fragment.source().filesystem()
> opened = GetResultValue(c_filesystem.OpenInputFile(
> self.file_fragment.source().path()))
> out.set_random_access_file(opened)
> out.is_readable = True
> return out
> {code}
> Additionally, a ParquetFileFragment's metadata could be introspectable:
> {code}
> @property
> def metadata(self):
> from pyarrow._parquet import ParquetReader
> reader = ParquetReader()
> reader.open(self.open())
> return reader.metadata
> {code}
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