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https://issues.apache.org/jira/browse/ARROW-14105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422203#comment-17422203
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David Li commented on ARROW-14105:
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In particular, one thing that needs improvement is dictionary handling. Right
now the type promotion values don't get applied to indices/values; we should do
things like reconcile {{dictionary<int8, utf8>}} and {{dictionary<int32,
binary>}} to {{dictionary<int32, binary>}}. It may be worth making the type
promotion helpers iterator-based so that we can try to treat dictionaries
uniformly as well, instead of having to copy descriptors around (though this
requires the implementation to be in the header, unfortunately).
> [C++] Reconcile type promotion rules between if_else, case_when, coalesce,
> select
> ---------------------------------------------------------------------------------
>
> Key: ARROW-14105
> URL: https://issues.apache.org/jira/browse/ARROW-14105
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: David Li
> Assignee: David Li
> Priority: Major
> Labels: kernel, types
>
> These functions are all conceptually similar and need to promote argument
> types to a common type. Right now they all have different type promotion
> heuristics, and there are a few in-progress PRs to improve type support; once
> those land, we should also reconcile the type promotion logic they use -
> presumably, all of them should be able to use the exact same logic in the end.
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