andishgar commented on code in PR #47969:
URL: https://github.com/apache/arrow/pull/47969#discussion_r2494131985


##########
cpp/src/arrow/array/statistics_test.cc:
##########
@@ -25,12 +25,20 @@
 
 namespace arrow {
 
-TEST(TestArrayStatistics, NullCount) {
+TEST(TestArrayStatistics, NullCountExact) {
   ArrayStatistics statistics;
   ASSERT_FALSE(statistics.null_count.has_value());
   statistics.null_count = 29;
   ASSERT_TRUE(statistics.null_count.has_value());
-  ASSERT_EQ(29, statistics.null_count.value());
+  ASSERT_EQ(29, std::get<int64_t>(statistics.null_count.value()));
+}
+
+TEST(TestArrayStatistics, NullCountApproximate) {
+  ArrayStatistics statistics;
+  ASSERT_FALSE(statistics.null_count.has_value());
+  statistics.null_count = 29.0;
+  ASSERT_TRUE(statistics.null_count.has_value());
+  ASSERT_EQ(29.0, std::get<double>(statistics.null_count.value()));

Review Comment:
   Regarding this, the entire test file has the same problem. Should I fix all 
of them, even the parts that are not related to this PR?



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