save-buffer commented on a change in pull request #11876:
URL: https://github.com/apache/arrow/pull/11876#discussion_r764366267



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File path: cpp/src/arrow/compute/exec/CMakeLists.txt
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@@ -32,6 +32,9 @@ add_arrow_compute_test(util_test PREFIX "arrow-compute")
 
 add_arrow_benchmark(expression_benchmark PREFIX "arrow-compute")
 
+find_package(OpenMP)
+add_arrow_benchmark(hash_join_benchmark PREFIX "arrow-compute" EXTRA_LINK_LIBS 
OpenMP::OpenMP_CXX)

Review comment:
       I changed it so that it won't break compilation - it'll just not build 
this particular target in the absence of OpenMP. 




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