[jira] [Created] (ARROW-17226) [C++] Extend hash-join unit tests to cover both empty and length=0 batches

[Weston Pace (Jira)]

Weston Pace created ARROW-17226:
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             Summary: [C++] Extend hash-join unit tests to cover both empty and 
length=0 batches
                 Key: ARROW-17226
                 URL: https://issues.apache.org/jira/browse/ARROW-17226
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace
             Fix For: 10.0.0


Follow-up to ARROW-15938 so that we can merge ARROW-15938 for the RC.  This 
just adds the unit test requested in the review.



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