jianxind commented on a change in pull request #6954:
URL: https://github.com/apache/arrow/pull/6954#discussion_r411045620



##########
File path: cpp/cmake_modules/DefineOptions.cmake
##########
@@ -101,7 +101,6 @@ if("${CMAKE_SOURCE_DIR}" STREQUAL 
"${CMAKE_CURRENT_SOURCE_DIR}")
   define_option_string(ARROW_SIMD_LEVEL
                        "SIMD compiler optimization level"
                        "SSE4_2" # default to SSE4.2
-                       "NONE"

Review comment:
       I personally prefer to keep the NONE(zero) level here though it may 
duplicate to ARROW_USE_SIMD. Level usually start from zero.




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