kou commented on PR #44365:
URL: https://github.com/apache/arrow/pull/44365#issuecomment-2404469591

   I'm not sure when we need `ARROW_EXPORT`...
   For example, 
https://github.com/apache/arrow/pull/44365/commits/a365cbf64601bc030202aab32a4fbe3e88d64b76
 is needed... Here is the error message without it:
   
   
https://github.com/apache/arrow/actions/runs/11268303462/job/31334825247#step:9:1229
   
   ```text
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(178): error C2220: the 
following warning is treated as an error
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(178): warning C4661: 
'int32_t arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros(void) 
const': no suitable definition provided for explicit template instantiation 
request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros'
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(178): warning C4661: 
'int32_t arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros(void) 
const': no suitable definition provided for explicit template instantiation 
request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros'
   
D:\a\arrow\arrow\build\cpp\src\arrow\CMakeFiles\arrow_io_shared.dir\Unity\unity_0_cxx.cxx(27):
 warning C4661: 'int32_t 
arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros(void) const': no 
suitable definition provided for explicit template instantiation request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros'
   
D:\a\arrow\arrow\build\cpp\src\arrow\CMakeFiles\arrow_io_shared.dir\Unity\unity_0_cxx.cxx(27):
 warning C4661: 'int32_t 
arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros(void) const': no 
suitable definition provided for explicit template instantiation request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros'
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(192): warning C4661: 
'int32_t arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros(void) 
const': no suitable definition provided for explicit template instantiation 
request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int32_t>::CountLeadingBinaryZeros'
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(192): warning C4661: 
'int32_t arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros(void) 
const': no suitable definition provided for explicit template instantiation 
request
   D:\a\arrow\arrow\cpp\src\arrow/util/basic_decimal.h(244): note: see 
declaration of 'arrow::SmallBasicDecimal<int64_t>::CountLeadingBinaryZeros'
   [184/608] Building CXX object 
src\arrow\CMakeFiles\arrow_array_shared.dir\Unity\unity_2_cxx.cxx.obj
   ```


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