jgiannuzzi commented on code in PR #47811:
URL: https://github.com/apache/arrow/pull/47811#discussion_r2436116997


##########
ci/scripts/install_cmake.sh:
##########
@@ -49,6 +49,9 @@ case ${platform} in
     ;;
   MSYS_NT*|MINGW64_NT*)
     platform=windows
+    if [[ "$(uname)" == *-ARM64 ]]; then
+      arch=arm64
+    fi

Review Comment:
   good point - done!
   `uname` is not a reliable way to find the CPU architecture on msys2, so I 
relied on a powershell one-liner instead. I also used a bash conditional fall 
through to unify the installation between macOS and Linux.



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