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[jira] [Created] (ARROW-3251) [C++] Conversion warnings in cast.cc


Antoine Pitrou created ARROW-3251:
-------------------------------------

             Summary: [C++] Conversion warnings in cast.cc
                 Key: ARROW-3251
                 URL: https://issues.apache.org/jira/browse/ARROW-3251
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Antoine Pitrou


This is with gcc 7.3.0 and {{-Wconversion}}.

{code}
../src/arrow/compute/kernels/cast.cc: In instantiation of ‘void arrow::compute::CastFunctor<O, I, typename std::enable_if<arrow::compute::is_float_truncate<O, I>::value>::type>::operator()(arrow::compute::FunctionContext*, const arrow::compute::CastOptions&, const arrow::ArrayData&, arrow::ArrayData*) [with O = arrow::Int64Type; I = arrow::DoubleType; typename std::enable_if<arrow::compute::is_float_truncate<O, I>::value>::type = void]’:
../src/arrow/compute/kernels/cast.cc:1105:1:   required from here
../src/arrow/compute/kernels/cast.cc:291:45: warning: conversion to ‘in_type {aka double}’ from ‘long int’ may alter its value [-Wconversion]
           if (ARROW_PREDICT_FALSE(out_value != *in_data)) {
                                   ~~~~~~~~~~^~~~~
../src/arrow/util/macros.h:37:50: note: in definition of macro ‘ARROW_PREDICT_FALSE’
 #define ARROW_PREDICT_FALSE(x) (__builtin_expect(x, 0))
                                                  ^
../src/arrow/compute/kernels/cast.cc:301:45: warning: conversion to ‘in_type {aka double}’ from ‘long int’ may alter its value [-Wconversion]
           if (ARROW_PREDICT_FALSE(out_value != *in_data)) {
                                   ~~~~~~~~~~^~~~~
../src/arrow/util/macros.h:37:50: note: in definition of macro ‘ARROW_PREDICT_FALSE’
 #define ARROW_PREDICT_FALSE(x) (__builtin_expect(x, 0))
{code}



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