Joris Van den Bossche created ARROW-8733:
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Summary: [C++][Dataset][Python] ParquetFileFragment should provide
access to parquet FileMetadata
Key: ARROW-8733
URL: https://issues.apache.org/jira/browse/ARROW-8733
Project: Apache Arrow
Issue Type: Improvement
Components: C++, Python
Reporter: Joris Van den Bossche
Fix For: 1.0.0
Related to ARROW-8062 (as there we will also need a way to expose the global
FileMetadata). But independently, it would be useful to get access to the
FileMetadata on each {{ParquetFileFragment}} (eg to get access to the
statistics).
This would be relatively simple to code on the Python/R side, since we have
access to the file path, and could read the metadata from the file backing the
fragment, and return this as a FileMetadata object.
I am wondering if we want to integrate this with ARROW-8062, since when the
fragments were created from a {{_metadata}} file, a
{{ParquetFileFragment.metadata}} attribute would not need to read it from the
parquet file in this case, but from the global metadata (at least for eg the
row group data).
Another question: what for a ParquetFileFragment that maps to a single row
group?
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