[jira] [Commented] (ARROW-11762) [C++][Dataset] Refactor Partitioning to explicitly treat null and absent fields identically

["Apache Arrow JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17617230#comment-17617230 ] 

Apache Arrow JIRA Bot commented on ARROW-11762:
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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 per [project policy|https://arrow.apache.org/docs/dev/developers/bug_reports.html#issue-assignment]. 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++][Dataset] Refactor Partitioning to explicitly treat null and absent fields identically
> -------------------------------------------------------------------------------------------
>
>                 Key: ARROW-11762
>                 URL: https://issues.apache.org/jira/browse/ARROW-11762
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 3.0.0
>            Reporter: Ben Kietzman
>            Assignee: Weston Pace
>            Priority: Major
>
> ARROW-10438 adds support for partition expressions with explicit absence of a partition key by including an {{is_null(field_ref("absent key field name"))}} in the conjunction. Whenever possible, this should be preferred to an equivalent conjunction which simply omits an equality expression for the missing field.
> Additionally since an absent partition key and a null partition key is semantically equivalent to a  null valued partition key, we should ensure there is no difference in behavior. Currently, {{equal(field_ref("a"), literal(0))}} and {{and_(equal(field_ref("a"), literal(0)), is_null("b"))}} are formatted differently 



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