[ARROW-15718] [R] Joining two datasets crashes if use_threads=FALSE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.0.0
• Fix Version/s: 8.0.0
• Component/s: C++, R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/31169
• Assignee: Will Jones
• Reporter: Will Jones
• Created: 17/Feb/22 16:13
• Updated: 11/Jan/23 11:39
• Resolved: 21/Apr/22 08:16

Description

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.

Issue Links

• is related to: ARROW-14908 [R] join on dataset crashes on Windows
• links to: GitHub Pull Request #12845