WillAyd commented on code in PR #47282:
URL: https://github.com/apache/arrow/pull/47282#discussion_r2270999922


##########
cpp/src/arrow/testing/gtest_util_test.cc:
##########
@@ -287,9 +287,11 @@ TEST(TestWithinUlp, Float) {
 TEST(AssertTestWithinUlp, Basics) {
   AssertWithinUlp(123.4567, 123.45670000000015, 11);
   AssertWithinUlp(123.456f, 123.456085f, 11);
+#if !defined(_MSC_VER)

Review Comment:
   I'm not sure why the precision here is different for Windows - open to any 
ideas



##########
.github/workflows/cpp_extra.yml:
##########
@@ -174,3 +174,70 @@ jobs:
           ARCHERY_DOCKER_PASSWORD: ${{ secrets.DOCKERHUB_TOKEN }}
         continue-on-error: true
         run: archery docker push ${{ matrix.image }}
+
+  meson-windows:
+    needs: check-labels
+    name: ${{ matrix.title }}
+    runs-on: ${{ matrix.runs-on }}
+    if: needs.check-labels.outputs.ci-extra == 'true'
+    timeout-minutes: 75
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+            - runs-on: windows-2022
+              title: AMD64 Windows Meson 
+    steps:
+      - name: Checkout Arrow
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: recursive
+      - name: Download Timezone Database
+        shell: bash
+        run: ci/scripts/download_tz_database.sh
+      - name: Install ccache
+        shell: bash
+        run: |
+          ci/scripts/install_ccache.sh 4.6.3 /usr
+      - name: Setup ccache
+        shell: bash
+        run: |
+          ci/scripts/ccache_setup.sh
+      - name: ccache info
+        id: ccache-info
+        shell: bash
+        run: |
+          echo "cache-dir=$(ccache --get-config cache_dir)" >> $GITHUB_OUTPUT
+      - name: Cache ccache
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.ccache-info.outputs.cache-dir }}
+          key: cpp-ccache-windows-meson-${{ env.CACHE_VERSION }}-${{ 
hashFiles('cpp/**') }}
+          restore-keys: cpp-ccache-windows-meson-${{ env.CACHE_VERSION }}-
+        env:
+          # We can invalidate the current cache by updating this.
+          CACHE_VERSION: "2022-09-13"
+      - name: Setup Python
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # 
v5.6.0
+        with:
+          python-version: 3
+      - name: Install Meson
+        run: |
+          python3 -m pip install meson
+      - name: Build
+        shell: cmd
+        env:
+          ARROW_USE_MESON: ON
+          ARROW_HOME: C:\arrow-dist
+        run: |
+          meson setup cpp build/cpp --vsenv -Dauto_features=enabled 
-Dfuzzing=disabled -Dgcs=disabled -Ds3=disabled -Dazure=disabled

Review Comment:
   Because the Windows version of the meson setup has slightly different 
arguments (adds --vsenv and disables azure) I just invoked Meson directly here.
   
   If we want to add to the existing cpp_build.sh script I can look at passing 
via an environment variable or script argument, although maybe its just as easy 
to invoke meson directly?



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