Push fix for imprecisions on macOS

Author: pitrou

cpp/src/arrow/compute/kernels/aggregate_test.cc

@@ -4152,6 +4152,14 @@ class TestRandomQuantileKernel : public TestPrimitiveQuantileKernel<ArrowType> {
 
   void VerifyTDigest(const std::shared_ptr<ChunkedArray>& chunked,
                      std::vector<double>& quantiles) {
+    // For some reasons computations on macOS seem much more approximate.
+    // A possible explanation is that libc++ has less precise implementations
+    // of std::sin and std::asin, used in the TDigest implementation.
+#ifdef __APPLE__
+    constexpr double kRelativeTolerance = 0.09;
+#else
+    constexpr double kRelativeTolerance = 0.05;
+#endif
     TDigestOptions options(quantiles);
     ASSERT_OK_AND_ASSIGN(Datum out, TDigest(chunked, options));
     const auto& out_array = out.make_array();