[jira] [Resolved] (ARROW-14630) [C++] DCHECK in GroupByNode when error encountered

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

     [ https://issues.apache.org/jira/browse/ARROW-14630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li resolved ARROW-14630.
------------------------------
    Resolution: Fixed

Issue resolved by pull request 11640
[https://github.com/apache/arrow/pull/11640]

> [C++] DCHECK in GroupByNode when error encountered
> --------------------------------------------------
>
>                 Key: ARROW-14630
>                 URL: https://issues.apache.org/jira/browse/ARROW-14630
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 6.0.0
>            Reporter: Nicola Crane
>            Assignee: David Li
>            Priority: Major
>              Labels: pull-request-available, query-engine
>             Fix For: 6.0.1, 7.0.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> [~thisisnic] found that this example crashes:
> {code:java}
> library(arrow)
> library(dplyr)
> write_dataset(group_by(iris, Species), "iris_data")
> open_dataset("iris_data") %>%
>   group_by(Species) %>%
>   summarise(mean(Sepal.Length)) %>%
>   collect()  {code}
> There are two bugs here:
>  * StopProducing is written in a way that causes a future to be finished twice, triggering a DCHECK.
>  * Consume() doesn't set the length of the key column batch, causing a spurious error because the group ID datum and the values datum will have different lengths.



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