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https://issues.apache.org/jira/browse/ARROW-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470543#comment-17470543
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Jeroen van Straten commented on ARROW-7051:
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I wouldn't call this for every buffer; I would do it in conjunction with the
power-of-two size buffer size caching that you suggested in the first comment.
But whether it's worth doing (and worth the additional maintenance), I don't
know.
> [C++] Improve MakeArrayOfNull to support creation of multiple arrays
> --------------------------------------------------------------------
>
> Key: ARROW-7051
> URL: https://issues.apache.org/jira/browse/ARROW-7051
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 0.14.0
> Reporter: Ben Kietzman
> Assignee: Jeroen van Straten
> Priority: Minor
> Labels: beginner, good-first-issue
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> MakeArrayOfNull reuses a single buffer of {{0}} for all buffers in the array
> it creates. It could be extended to reuse that same buffer for all buffers in
> multiple arrays. This optimization will make RecordBatchProjector and
> ConcatenateTablesWithPromotion more memory efficient
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