[jira] [Resolved] (ARROW-15441) [C++][Compute] hash_count aggregation of a null type column is incorrect

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li resolved ARROW-15441.
------------------------------
    Fix Version/s: 8.0.0
       Resolution: Fixed

Issue resolved by pull request 12251
[https://github.com/apache/arrow/pull/12251]

> [C++][Compute] hash_count aggregation of a null type column is incorrect
> ------------------------------------------------------------------------
>
>                 Key: ARROW-15441
>                 URL: https://issues.apache.org/jira/browse/ARROW-15441
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Chenxi Li
>            Assignee: Chenxi Li
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> The result of hash_count such array is incorrect.
> ||argument||key||
> |NULL|1|
> |NULL|1|
>  
> ||CountOptions||Expected||Actual||
> |ALL|2|2|
> |ONLY_VALID|{color:#FF0000}0{color}|{color:#FF0000}2{color}|
> |ONLY_NULL|{color:#FF0000}2{color}|{color:#FF0000}0{color}|



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