[jira] [Created] (ARROW-12485) [C++] Use mimalloc as the default memory allocator on macOS

[Jonathan Keane (Jira)]

Jonathan Keane created ARROW-12485:
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             Summary: [C++] Use mimalloc as the default memory allocator on 
macOS
                 Key: ARROW-12485
                 URL: https://issues.apache.org/jira/browse/ARROW-12485
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Jonathan Keane


This is a follow on to ARROW-12316 which was supposed to do that (and I thought 
it did!) but now I'm suspecting we actually wanted that if logic at 
https://github.com/apache/arrow/blob/master/cpp/src/arrow/memory_pool.cc#L168-L180
 instead/as well



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