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https://issues.apache.org/jira/browse/ARROW-9227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17315759#comment-17315759
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Antoine Pitrou commented on ARROW-9227:
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It's not obvious which kind of metadata field would store the info, and it
would probably be non-standard.
Suggest closing.
> [Python][Dataset] Write a custom field to _metadata caching file size
> ---------------------------------------------------------------------
>
> Key: ARROW-9227
> URL: https://issues.apache.org/jira/browse/ARROW-9227
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Affects Versions: 0.17.1
> Reporter: Ben Kietzman
> Priority: Major
> Fix For: 4.0.0
>
>
> https://github.com/apache/arrow/pull/7547#discussion_r445663612
> This will save unecessary HEAD requests when using S3
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