[jira] [Commented] (ARROW-7051) [C++] Improve MakeArrayOfNull to support creation of multiple arrays

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

    [ https://issues.apache.org/jira/browse/ARROW-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448170#comment-17448170 ] 

Antoine Pitrou commented on ARROW-7051:
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[~aocsa] Do you still want to do this? Otherwise please unassign to let others know that they can take it.

> [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: Alexander Ocsa
>            Priority: Minor
>              Labels: beginner
>
> 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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