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https://issues.apache.org/jira/browse/ARROW-7608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020363#comment-17020363
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Neal Richardson commented on ARROW-7608:
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Source's type_name doesn't appear to be useful: what is "tree"?
https://github.com/apache/arrow/blob/master/cpp/src/arrow/dataset/dataset.h#L150
How do I get Format from Source?
> [C++][Dataset] Expose more informational properties
> ---------------------------------------------------
>
> Key: ARROW-7608
> URL: https://issues.apache.org/jira/browse/ARROW-7608
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++ - Dataset
> Reporter: Neal Richardson
> Assignee: Francois Saint-Jacques
> Priority: Major
>
> In thinking about what I'd want a useful print method for a Dataset in R to
> include, there are a few things that come to mind, and by skimming dataset.h,
> they're not available:
> * How many Sources it has
> * For a Source, what kind (local filesystem, other filesystem, etc.), base
> path (at least where we didn't provide a list of files), how many files, what
> file format
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