Add unit tests in segcore (#15960)

Signed-off-by: Letian Jiang <letian.jiang@zilliz.com>

internal/core/unittest/test_segcore.cpp

@@ -56,6 +56,7 @@ TEST(SegmentCoreTest, NormalDistributionTest) {
     segment->PreDelete(N);
 }
 
+// Test insert row-based data
 TEST(SegmentCoreTest, MockTest) {
     using namespace milvus::segcore;
     using namespace milvus::engine;
@@ -95,6 +96,80 @@ TEST(SegmentCoreTest, MockTest) {
     i++;
 }
 
+// Test insert column-based data
+TEST(SegmentCoreTest, MockTest2) {
+   using namespace milvus::segcore;
+   using namespace milvus::engine;
+
+   // schema
+   auto schema = std::make_shared<Schema>();
+   schema->AddDebugField("fakevec", DataType::VECTOR_FLOAT, 16, MetricType::METRIC_L2);
+   schema->AddDebugField("age", DataType::INT32);
+
+   // generate random row-based data
+   std::vector<char> row_data;
+   std::vector<Timestamp> timestamps;
+   std::vector<int64_t> uids;
+   int N = 10000; // number of records
+   std::default_random_engine e(67);
+   for (int i = 0; i < N; ++i) {
+       uids.push_back(100000 + i);
+       timestamps.push_back(0);
+       // append vec
+       float vec[16];
+       for (auto& x : vec) {
+           x = e() % 2000 * 0.001 - 1.0;
+       }
+       row_data.insert(row_data.end(), (const char*)std::begin(vec), (const char*)std::end(vec));
+       int age = e() % 100;
+       row_data.insert(row_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
+   }
+   auto line_sizeof = (sizeof(int) + sizeof(float) * 16);
+   assert(row_data.size() == line_sizeof * N);
+
+   int64_t size = N;
+   const int64_t* uids_raw = uids.data();
+   const Timestamp* timestamps_raw = timestamps.data();
+   std::vector<std::tuple<Timestamp, idx_t, int64_t>> ordering(size); // timestamp, pk, order_index
+   for (int i = 0; i < size; ++i) {
+      ordering[i] = std::make_tuple(timestamps_raw[i], uids_raw[i], i);
+   }
+   std::sort(ordering.begin(), ordering.end()); // sort according to timestamp
+
+   // convert row-based data to column-based data accordingly
+   auto sizeof_infos = schema->get_sizeof_infos();
+   std::vector<int> offset_infos(schema->size() + 1, 0);
+   std::partial_sum(sizeof_infos.begin(), sizeof_infos.end(), offset_infos.begin() + 1);
+   std::vector<aligned_vector<uint8_t>> entities(schema->size());
+
+   for (int fid = 0; fid < schema->size(); ++fid) {
+      auto len = sizeof_infos[fid];
+      entities[fid].resize(len * size);
+   }
+
+   auto raw_data = row_data.data();
+   std::vector<idx_t> sorted_uids(size);
+   std::vector<Timestamp> sorted_timestamps(size);
+   for (int index = 0; index < size; ++index) {
+      auto [t, uid, order_index] = ordering[index];
+      sorted_timestamps[index] = t;
+      sorted_uids[index] = uid;
+      for (int fid = 0; fid < schema->size(); ++fid) {
+         auto len = sizeof_infos[fid];
+         auto offset = offset_infos[fid];
+         auto src = raw_data + order_index * line_sizeof + offset;
+         auto dst = entities[fid].data() + index * len;
+         memcpy(dst, src, len);
+      }
+   }
+
+   // insert column-based data
+   ColumnBasedRawData data_chunk{entities, N};
+   auto segment = CreateGrowingSegment(schema);
+   auto reserved_begin = segment->PreInsert(N);
+   segment->Insert(reserved_begin, size, sorted_uids.data(), sorted_timestamps.data(), data_chunk);
+}
+
 TEST(SegmentCoreTest, SmallIndex) {
     using namespace milvus::segcore;
     using namespace milvus::engine;