[jira] [Resolved] (ARROW-257) Add a typeids Vector to Union type

["Julien Le Dem (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julien Le Dem resolved ARROW-257.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 143
[https://github.com/apache/arrow/pull/143]

> Add a typeids Vector to Union type
> ----------------------------------
>
>                 Key: ARROW-257
>                 URL: https://issues.apache.org/jira/browse/ARROW-257
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Format
>            Reporter: Julien Le Dem
>            Assignee: Julien Le Dem
>
> {noformat}
> enum UnionMode:int { Sparse, Dense }
> table Union {
>   mode: UnionMode;
>   typeIds: [Int32]; // optional, describes typeid of each child.
> }
> {noformat}
> The idea is to enable providing an id different from the child offset (the default)
> This enables an optimization where we use predefined ids when constructing the type vector of the union but want the children to be only the actually used types.



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