[jira] [Updated] (ARROW-10640) [C++] An "if_else" kernel to combine two arrays based on a mask

["Ian Cook (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ian Cook updated ARROW-10640:
-----------------------------
    Summary: [C++] An "if_else" kernel to combine two arrays based on a mask  (was: [C++] A "where" kernel to combine two arrays based on a mask)

> [C++] An "if_else" kernel to combine two arrays based on a mask
> ---------------------------------------------------------------
>
>                 Key: ARROW-10640
>                 URL: https://issues.apache.org/jira/browse/ARROW-10640
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Joris Van den Bossche
>            Assignee: Niranda Perera
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 10h
>  Remaining Estimate: 0h
>
> (from discussion in ARROW-9489 with [~maartenbreddels])
> A general "where" kernel like {{np.where}} (https://numpy.org/doc/stable/reference/generated/numpy.where.html) seems a generally useful kernel to have, and could also help mimicking some other python (setitem-like) operations. 
> The concrete use case in ARROW-9489 is to basically do a {{fill_null(array[string], array[string])}} which could be expressed as {{where(is_null(arr), arr2, arr)}}. 



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