SuKi2cn commented on code in PR #373:
URL: https://github.com/apache/iceberg-cpp/pull/373#discussion_r2587598524
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src/iceberg/test/aggregate_test.cc:
##########
@@ -236,4 +237,239 @@ TEST(AggregateTest, MultipleAggregatesInEvaluator) {
EXPECT_EQ(std::get<int64_t>(results[4].value()), 4); // count_star
}
+TEST(AggregateTest, AggregatesFromDataFileMetrics) {
+ Schema schema({SchemaField::MakeOptional(1, "id", int32()),
+ SchemaField::MakeOptional(2, "value", int32())});
+
+ auto count_bound = BindAggregate(schema, Expressions::Count("id"));
+ auto count_null_bound = BindAggregate(schema, Expressions::CountNull("id"));
+ auto count_star_bound = BindAggregate(schema, Expressions::CountStar());
+ auto max_bound = BindAggregate(schema, Expressions::Max("value"));
+ auto min_bound = BindAggregate(schema, Expressions::Min("value"));
+
+ std::vector<std::shared_ptr<BoundAggregate>> aggregates{
+ count_bound, count_null_bound, count_star_bound, max_bound, min_bound};
+ ICEBERG_UNWRAP_OR_FAIL(auto evaluator, AggregateEvaluator::Make(aggregates));
+
+ DataFile file;
+ file.record_count = 10;
+ file.value_counts.emplace(1, 10);
+ file.null_value_counts.emplace(1, 2);
+ file.value_counts.emplace(2, 10);
+ file.null_value_counts.emplace(2, 0);
+ ICEBERG_UNWRAP_OR_FAIL(auto lower, Literal::Int(5).Serialize());
+ ICEBERG_UNWRAP_OR_FAIL(auto upper, Literal::Int(50).Serialize());
+ file.lower_bounds.emplace(2, lower);
+ file.upper_bounds.emplace(2, upper);
+
+ ASSERT_TRUE(evaluator->Update(file).has_value());
+
+ ICEBERG_UNWRAP_OR_FAIL(auto results, evaluator->GetResults());
+ ASSERT_EQ(results.size(), aggregates.size());
+ EXPECT_EQ(std::get<int64_t>(results[0].value()), 8); // count(id) = 10 - 2
+ EXPECT_EQ(std::get<int64_t>(results[1].value()), 2); // count_null(id)
+ EXPECT_EQ(std::get<int64_t>(results[2].value()), 10); // count_star
+ EXPECT_EQ(std::get<int32_t>(results[3].value()), 50); // max(value)
+ EXPECT_EQ(std::get<int32_t>(results[4].value()), 5); // min(value)
+}
+
+TEST(AggregateTest, AggregatesFromDataFileMissingMetricsReturnNull) {
+ Schema schema({SchemaField::MakeOptional(1, "id", int32()),
+ SchemaField::MakeOptional(2, "value", int32())});
+
+ auto count_bound = BindAggregate(schema, Expressions::Count("id"));
+ auto count_null_bound = BindAggregate(schema, Expressions::CountNull("id"));
+ auto count_star_bound = BindAggregate(schema, Expressions::CountStar());
+ auto max_bound = BindAggregate(schema, Expressions::Max("value"));
+ auto min_bound = BindAggregate(schema, Expressions::Min("value"));
+
+ std::vector<std::shared_ptr<BoundAggregate>> aggregates{
+ count_bound, count_null_bound, count_star_bound, max_bound, min_bound};
+ ICEBERG_UNWRAP_OR_FAIL(auto evaluator, AggregateEvaluator::Make(aggregates));
+
+ DataFile file;
+ file.record_count = -1; // missing/invalid
+
+ ASSERT_TRUE(evaluator->Update(file).has_value());
+
+ ICEBERG_UNWRAP_OR_FAIL(auto results, evaluator->GetResults());
+ ASSERT_EQ(results.size(), aggregates.size());
+ for (const auto& literal : results) {
+ EXPECT_TRUE(literal.IsNull());
+ }
+}
+
+TEST(AggregateTest, AggregatesFromDataFileWithTransform) {
+ Schema schema({SchemaField::MakeOptional(1, "id", int32())});
+
+ auto truncate_id = Expressions::Truncate("id", 10);
+ auto max_bound = BindAggregate(schema, Expressions::Max(truncate_id));
+ auto min_bound = BindAggregate(schema, Expressions::Min(truncate_id));
+
+ std::vector<std::shared_ptr<BoundAggregate>> aggregates{max_bound,
min_bound};
+ ICEBERG_UNWRAP_OR_FAIL(auto evaluator, AggregateEvaluator::Make(aggregates));
+
+ DataFile file;
+ file.record_count = 5;
+ file.value_counts.emplace(1, 5);
+ file.null_value_counts.emplace(1, 0);
+ ICEBERG_UNWRAP_OR_FAIL(auto lower, Literal::Int(5).Serialize());
+ ICEBERG_UNWRAP_OR_FAIL(auto upper, Literal::Int(23).Serialize());
+ file.lower_bounds.emplace(1, lower);
+ file.upper_bounds.emplace(1, upper);
+
+ ASSERT_TRUE(evaluator->Update(file).has_value());
+
+ ICEBERG_UNWRAP_OR_FAIL(auto results, evaluator->GetResults());
+ ASSERT_EQ(results.size(), aggregates.size());
+ // Truncate width 10: max(truncate(23)) -> 20, min(truncate(5)) -> 0
+ EXPECT_EQ(std::get<int32_t>(results[0].value()), 20);
+ EXPECT_EQ(std::get<int32_t>(results[1].value()), 0);
+ EXPECT_TRUE(evaluator->AllAggregatorsValid());
+}
+
+TEST(AggregateTest, DataFileAggregatorParityWithJava) {
Review Comment:
> modify this?
Yep. It's way better.
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