Wes McKinney created ARROW-381:
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             Summary: [C++] Simplify primitive array type builders to use a 
default type singleton
                 Key: ARROW-381
                 URL: https://issues.apache.org/jira/browse/ARROW-381
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney


Currently the builder classes all expect to be passed a 
{{shared_ptr<DataType>}} -- for the primitive types (boolean, numbers, strings, 
etc.) it would be simpler to default to a common value rather than requiring 
that you obtain an instance yourself from someplace (e.g. {{arrow::uint8()}} as 
in the WIP patch for ARROW-373)



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