Wes McKinney created ARROW-7010:
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             Summary: [C++] Support lossy casts from decimal128 to float32 and 
float64/double
                 Key: ARROW-7010
                 URL: https://issues.apache.org/jira/browse/ARROW-7010
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney
             Fix For: 1.0.0


I do not believe such casts are implemented. This can be helpful for people 
analyzing data where the precision of decimal128 is not needed



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