nealrichardson commented on pull request #8650:
URL: https://github.com/apache/arrow/pull/8650#issuecomment-740195890
FYI Windows build failure is
```
r_to_arrow.cpp: In instantiation of 'arrow::Status
arrow::r::VisitInt64Vector(SEXP, R_xlen_t, VisitorFunc&&) [with VisitorFunc =
arrow::r::VisitVector(SEXP, R_xlen_t, T*) [with T =
arrow::internal::Converter<arrow::r::RScalar*, arrow::r::RConversionOptions>;
SEXP = SEXPREC*; R_xlen_t = int]::<lambda(arrow::r::RScalar*)>; SEXP =
SEXPREC*; R_xlen_t = int]':
r_to_arrow.cpp:512:84: required from 'arrow::Status
arrow::r::VisitVector(SEXP, R_xlen_t, T*) [with T =
arrow::internal::Converter<arrow::r::RScalar*, arrow::r::RConversionOptions>;
SEXP = SEXPREC*; R_xlen_t = int]'
r_to_arrow.cpp:535:40: required from 'arrow::Status arrow::r::Extend(T*,
SEXP, R_xlen_t) [with T = arrow::internal::Converter<arrow::r::RScalar*,
arrow::r::RConversionOptions>; SEXP = SEXPREC*; R_xlen_t = int]'
r_to_arrow.cpp:762:7: required from here
r_to_arrow.cpp:451:66: error: dereferencing type-punned pointer will break
strict-aliasing rules [-Werror=strict-aliasing]
obj.null = is_NA<int64_t>(*reinterpret_cast<int64_t*>(&value));
^
```
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