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[jira] [Created] (ARROW-3527) [R] Unused variables in R-package C++ code

James Lamb created ARROW-3527:

             Summary: [R] Unused variables in R-package C++ code
                 Key: ARROW-3527
                 URL: https://issues.apache.org/jira/browse/ARROW-3527
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: James Lamb

Tonight I noticed a few "unused variable" compiler warnings tonight while building the arrow R package.

DataType.cpp:118:7: warning: unused variable 'n' [-Wunused-variable]
int n = x.size();

RecordBatch.cpp:132:7: warning: unused variable 'nc' [-Wunused-variable]
int nc = tbl.size();
Creating this issue to accompany the PR I'll submit to propose removing these calls.

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