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https://issues.apache.org/jira/browse/ARROW-8163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17568181#comment-17568181
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Pavel Solodovnikov commented on ARROW-8163:
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[~westonpace] Thanks!

> [C++][Dataset] Allow FileSystemDataset's file list to be lazy
> -------------------------------------------------------------
>
>                 Key: ARROW-8163
>                 URL: https://issues.apache.org/jira/browse/ARROW-8163
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 0.16.0
>            Reporter: Ben Kietzman
>            Assignee: Pavel Solodovnikov
>            Priority: Major
>              Labels: dataset
>
> A FileSystemDataset currently requires a full listing of files it contains on 
> construction, so a scan cannot start until all files in the dataset are 
> discovered. Instead it would be ideal if a large dataset could be constructed 
> with a lazy file listing so that scans can start immediately.



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