[jira] [Commented] (ARROW-9270) [C++] Create Buffer to represent a slice of a ResizableBuffer that may yet reallocate

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-9270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148146#comment-17148146 ] 

Antoine Pitrou commented on ARROW-9270:
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Out of curiosity, what is the use case?

> [C++] Create Buffer to represent a slice of a ResizableBuffer that may yet reallocate
> -------------------------------------------------------------------------------------
>
>                 Key: ARROW-9270
>                 URL: https://issues.apache.org/jira/browse/ARROW-9270
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>
> One problem with slicing ResizableBuffer is that slices of a buffer that is still changing may be invalidated after a resize operation. I'd be interested in having a way to slice a ResizableBuffer where the slice is still usable after a resize. This would presume, of course, that the code responsible for the parent and child buffers behaves appropriately (e.g. if you call {{child->data()}} and then resize the parent, the pointer may become invalid



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