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https://issues.apache.org/jira/browse/ARROW-5588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Francois Saint-Jacques resolved ARROW-5588.
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Resolution: Fixed
Fix Version/s: 1.0.0
Issue resolved by pull request 4781
[https://github.com/apache/arrow/pull/4781]
> [C++] Better support for building UnionArrays
> ---------------------------------------------
>
> Key: ARROW-5588
> URL: https://issues.apache.org/jira/browse/ARROW-5588
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Benjamin Kietzman
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> UnionBuilders (for both sparse and dense mode unions) are not currently
> supported by MakeBuilder or ArrayFromJSON. This increases friction when
> working with and testing against union arrays, and support should be added to
> both. For ArrayFromJSON each entry must be specified with a (type code,
> value) pair:
> {code}
> ArrayFromJSON(union_({field("lint", list(int32())), field("str", utf8())}),
> R"([
> [0, null],
> [1, "hello"],
> [0, [1, 2]],
> [1, "world"]
> ])");
> {code}
> DenseUnionBuilder currently requires the user to explicitly input offsets,
> but if it were modified to hold pointers to child builders (as ListBuilder,
> for example) then those offsets could be derived from the lengths of child
> builders (which is much more user friendly).
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