[C++] Can't build with g++ 4.8.5 on CentOS 7 by member initializer for shared_ptr

[asfimport]

% g++ --version
g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Error message:

/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc: In instantiation of 'arrow::Status arrow::py::GetConverterFlat(const std::shared_ptr<arrow::DataType>&, bool, std::unique_ptr<arrow::py::SeqConverter>*) [with arrow::py::NullCoding null_coding = (arrow::py::NullCoding)1]':
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:1001:5:   required from here
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:864:7: error: conversion from 'std::nullptr_t' to non-scalar type 'std::shared_ptr<arrow::DecimalType>' requested
 class DecimalConverter
       ^
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:894:10: note: synthesized method 'arrow::py::DecimalConverter<(arrow::py::NullCoding)1>::DecimalConverter()' first required here 
     *out = std::unique_ptr<SeqConverter>(new TYPE_CLASS<null_coding>); \
          ^
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:915:5: note: in expansion of macro 'SIMPLE_CONVERTER_CASE'
     SIMPLE_CONVERTER_CASE(DECIMAL, DecimalConverter);
     ^
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc: In instantiation of 'arrow::Status arrow::py::GetConverterFlat(const std::shared_ptr<arrow::DataType>&, bool, std::unique_ptr<arrow::py::SeqConverter>*) [with arrow::py::NullCoding null_coding = (arrow::py::NullCoding)0]':
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:1004:5:   required from here
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:864:7: error: conversion from 'std::nullptr_t' to non-scalar type 'std::shared_ptr<arrow::DecimalType>' requested
 class DecimalConverter
       ^
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:894:10: note: synthesized method 'arrow::py::DecimalConverter<(arrow::py::NullCoding)0>::DecimalConverter()' first required here 
     *out = std::unique_ptr<SeqConverter>(new TYPE_CLASS<null_coding>); \
          ^
/root/rpmbuild/BUILD/apache-arrow-0.15.0/cpp/src/arrow/python/python_to_arrow.cc:915:5: note: in expansion of macro 'SIMPLE_CONVERTER_CASE'
     SIMPLE_CONVERTER_CASE(DECIMAL, DecimalConverter);
     ^

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

PRs and other links:

• GitHub Pull Request #5456

_{Note: This issue was originally created as ARROW-6647. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 5456
#5456