[jira] [Created] (ARROW-7764) [C++] Builders allocate a null bitmap buffer even if there is no nulls

[Francois Saint-Jacques (Jira)]

Francois Saint-Jacques created ARROW-7764:
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             Summary: [C++] Builders allocate a null bitmap buffer even if 
there is no nulls
                 Key: ARROW-7764
                 URL: https://issues.apache.org/jira/browse/ARROW-7764
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Francois Saint-Jacques


This is an optimization where we can coalesce to nullptr if there's no null in 
the array.



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