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https://issues.apache.org/jira/browse/ARROW-9249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-9249.
---------------------------------
Resolution: Fixed
Resolved in
https://github.com/apache/arrow/commit/e1c3334d548f0eb8cbf5c6eca84737dede8ee271
> [C++] Implement "list_parent_indices" vector function
> ------------------------------------------------------
>
> Key: ARROW-9249
> URL: https://issues.apache.org/jira/browse/ARROW-9249
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 1.0.0
>
>
> The return value has the same size as the child array of a List type and
> contains values providing the "cell index" of each child value relative to
> the parent list array.
> For example, the list array
> {code}
> [ [0, 1], null, [2], [3, 4]]
> {code}
> would output
> {code}
> [0, 0, 2, 3, 3]
> {code}
> Note that there is no null because the child array has no nulls. If the list
> has null values whose offsets point to non-empty child sections then these
> will have to be null in the output to preserve the contract that the output
> array has the same length as the child array
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