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https://issues.apache.org/jira/browse/ARROW-7179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17396577#comment-17396577
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Joris Van den Bossche commented on ARROW-7179:
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We actually already have a "fill_null" kernel for filling with a scalar (added
in ), so this issue was about expanding that kernel to also support array fill
values. That's indeed the same as coalesce. But, "fill_null" is currently a
fully separate implementation (scalar_fill_null.cc), while I suppose "coalesce"
might also have a specialized path for scalar fill values? That could
potentially be consolidated?
> [C++][Compute] Array support for fill_null
> ------------------------------------------
>
> Key: ARROW-7179
> URL: https://issues.apache.org/jira/browse/ARROW-7179
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 0.15.1
> Reporter: Ben Kietzman
> Assignee: David Li
> Priority: Major
> Labels: analytics
> Fix For: 5.0.0
>
>
> Add kernels to support which replacing null values in an array with values
> taken from corresponding slots in another array:
> {code}
> fill_null([1, null, null, 3], [5, 6, null, 8]) -> [1, 6, null, 3]
> {code}
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