Joris Van den Bossche created ARROW-8074:
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Summary: [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++ - Dataset, Python
Reporter: Joris Van den Bossche
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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