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https://issues.apache.org/jira/browse/ARROW-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17394141#comment-17394141
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Antoine Pitrou commented on ARROW-7051:
---------------------------------------
Another approach would be to define a separate function that caches
power-of-two-sized buffers of zeros:
{code:c++}
/// Make read-only buffer of zeros
Result<std::shared_ptr<Buffer>> MakeBufferOfZeros(int64_t length);
{code}
The two approaches might be combined for maximum efficiency...
> [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
> 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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