pitrou commented on a change in pull request #11916:
URL: https://github.com/apache/arrow/pull/11916#discussion_r768626457
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File path: ci/docker/conda-cpp.dockerfile
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@@ -54,6 +56,7 @@ ENV ARROW_BUILD_TESTS=ON \
ARROW_WITH_SNAPPY=ON \
ARROW_WITH_ZLIB=ON \
ARROW_WITH_ZSTD=ON \
+ CMAKE_CXX_STANDARD=17 \
Review comment:
Well, we already have the
[following](https://github.com/apache/arrow/blob/master/cpp/cmake_modules/SetupCxxFlags.cmake#L122-L124):
```cmake
if(NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 11)
endif()
```
The only difference AFAICT is that we don't error out if the user explicitly
asked for something earlier than C++11, but that must be a _really_ rare case.
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