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https://issues.apache.org/jira/browse/ARROW-15718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weston Pace resolved ARROW-15718.
---------------------------------
Resolution: Fixed
Issue resolved by pull request 12845
[https://github.com/apache/arrow/pull/12845]
> [R] Joining two datasets crashes if use_threads=FALSE
> -----------------------------------------------------
>
> Key: ARROW-15718
> URL: https://issues.apache.org/jira/browse/ARROW-15718
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, R
> Affects Versions: 7.0.0
> Reporter: Will Jones
> Assignee: Will Jones
> Priority: Major
> Labels: pull-request-available
> Fix For: 8.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> In ARROW-14908 we solved the case of joining a dataset to an in memory table,
> but did not solve joining two datasets.
> The previous solution was to add +1 to the thread count, because the hash
> join logic might be called by the scanner's IO thread. For joining more than
> 1 dataset, we might have more than 1 IO thread, so we either need to add a
> larger arbitrary number or find a way to make the state logic more resilient
> to unexpected threads.
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