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https://issues.apache.org/jira/browse/ARROW-8074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman updated ARROW-8074:
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Labels: dataset dataset-dask-integration pull-request-available (was:
dataset pull-request-available)
> [C++][Dataset] Support for file-like objects (buffers) in FileSystemDataset?
> ----------------------------------------------------------------------------
>
> Key: ARROW-8074
> URL: https://issues.apache.org/jira/browse/ARROW-8074
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Python
> Reporter: Joris Van den Bossche
> Assignee: Ben Kietzman
> Priority: Major
> Labels: dataset, dataset-dask-integration, pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 7h 10m
> Remaining Estimate: 0h
>
> The current {{pyarrow.parquet.read_table}}/{{ParquetFile}} can work with
> buffer (reader) objects (file-like objects, pyarrow.Buffer,
> pyarrow.BufferReader) as input when dealing with single files. This
> functionality is for example being used by pandas and kartothek (in addition
> to being extensively used in our own tests as well).
> While we could keep the old implementation to handle single files (which is
> different from the ParquetDataset logic), there are also some advantages of
> being able to handle this in the Datasets API.
> For example, this would enable to filtering functionality of the datasets
> API, also for this single-file buffers use case, which would be a nice
> enhancement (currently, {{read_table}} does not support {{filters}} in case
> of single files, which is eg why kartothek implements this themselves).
> Would this be possible to support?
> The {{arrow::dataset::FileSource}} already has PATH and BUFFER enum types
> (https://github.com/apache/arrow/blob/08f8bff05af37921ff1e5a2b630ce1e7ec1c0ede/cpp/src/arrow/dataset/file_base.h#L46-L49),
> so it seems in principle possible to create a FileSource (for a
> FileSystemDataset / FileFragment) from a buffer instead of from a path?
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