Try using AssertWithinUlp

Author: pitrou

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

@@ -3275,15 +3275,8 @@ void CheckVarStd(const Datum& array, const VarianceOptions& options,
   auto var = checked_cast<const DoubleScalar*>(out_var.scalar().get());
   auto std = checked_cast<const DoubleScalar*>(out_std.scalar().get());
   ASSERT_TRUE(var->is_valid && std->is_valid);
-  // Near zero these macros don't work as well
-  // (and MinGW can give results slightly off from zero)
-  if (std::abs(expected_var) < 1e-20) {
-    ASSERT_NEAR(std->value * std->value, var->value, 1e-20);
-    ASSERT_NEAR(var->value, expected_var, 1e-20);
-  } else {
-    ASSERT_DOUBLE_EQ(std->value * std->value, var->value);
-    ASSERT_DOUBLE_EQ(var->value, expected_var);  // < 4ULP
-  }
+  AssertWithinUlp(std->value * std->value, var->value, /*n_ulps=*/3);
+  AssertWithinUlp(var->value, expected_var, /*n_ulps=*/3);
 }
 
 template <typename ArrowType>