Hello! The benchmark executables are placed in the same directory as the other test executables: https://github.com/apache/arrow/blob/b4ac585ecb4da610cc64e346e564ca86594aec53/cpp/cmake_modules/BuildUtils.cmake#L614.
This means that if somebody builds the benchmarks with `ARROW_BUILD_BENCHMARK=ON`, and then naively runs `ctest .` in the test folder, they will also be running the very slow benchmark tests. (There does exist a workaround, which is to use the flag `--label-regex unittest`.) Considering that `ctest` is not the standard way the benchmark executables are run, they are usually run with the archery utility ( https://arrow.apache.org/docs/developers/benchmarks.html), would there be support in moving the benchmark executables to a seperate build subdirectory from the unittest executables? Is there value in having them in the same location, all runnable with `ctest .`? ~* Anja
