[jira] [Assigned] (ARROW-11508) [C++][Compute] Add support for generic conversions to Function::DispatchBest

["Todd Farmer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Farmer reassigned ARROW-11508:
-----------------------------------

    Assignee:     (was: Ben Kietzman)

This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [C++][Compute] Add support for generic conversions to Function::DispatchBest
> ----------------------------------------------------------------------------
>
>                 Key: ARROW-11508
>                 URL: https://issues.apache.org/jira/browse/ARROW-11508
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>    Affects Versions: 3.0.0
>            Reporter: Ben Kietzman
>            Priority: Major
>
> ARROW-8919 adds support for execution with implicit casts to any function which overrides DispatchBest, allowing functions to specify conversions which make sense in that function's context. For example "add" can promote its arguments if their types disagree. By contrast, some conversions are more generic and could be applicable to any function's arguments. For example if any datum is dictionary encoded, a kernel which accepts the decoded type should be usable with an implicit decoding cast:
> {code:java}
> import pyarrow as pa
> import pyarrow.compute as pc
> arr = pa.array('hello ' * 10)
> enc = arr.dictionary_encode()
> # result should not depend on encoding:
> assert pc.ascii_is_alnum(arr) == pc.ascii_is_alnum(enc)
> # currently raises:
> # ArrowNotImplementedError: Function ascii_is_alnum has no kernel matching
> #    input types (array[dictionary<values=string, indices=int32, ordered=0>])
> {code}



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