Neal Richardson created ARROW-6365:
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             Summary: [R] Should be able to coerce numeric to integer with 
schema
                 Key: ARROW-6365
                 URL: https://issues.apache.org/jira/browse/ARROW-6365
             Project: Apache Arrow
          Issue Type: Improvement
          Components: R
            Reporter: Neal Richardson
             Fix For: 0.15.0


R is flexible when it comes to integer vs. floating point, generally obscuring 
the details inside a "numeric" class, but it knows how to make it seem like my 
integer-looking data stored in a double is actually integer. This means that an 
R user can think they have integers even when the underlying storage is not. 

So I would have expected this to work, and indeed to be one reason I'd want to 
specify a schema when creating a table:

{code:r}
> table(a = 1, schema = schema(a = int32()))
Error in Table__from_dots(dots, schema) : 
  Invalid: Cannot convert R vector of type REALSXP to integer Arrow array
{code}



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