[jira] [Created] (ARROW-15718) [R] Joining two datasets crashes if use_threads=FALSE

["Will Jones (Jira)" <ji...@apache.org>]

Will Jones created ARROW-15718:
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             Summary: [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
             Fix For: 8.0.0


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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