[jira] [Resolved] (ARROW-5588) [C++] Better support for building UnionArrays

["Francois Saint-Jacques (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francois Saint-Jacques resolved ARROW-5588.
-------------------------------------------
       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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