Fix mac build error (#16415)

Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

internal/core/src/segcore/load_index_c.cpp

@@ -87,7 +87,9 @@ AppendIndex(CLoadIndexInfo c_load_index_info, CBinarySet c_binary_set) {
         AssertInfo(find_index_type == true, "Can't find index type in index_params");
         knowhere::IndexMode mode;
         if (find_index_mode) {
-            mode = index_params["index_mode"] == "CPU" ? knowhere::IndexMode::MODE_CPU : knowhere::IndexMode::MODE_GPU;
+            std::string index_mode = index_params["index_mode"];
+            mode = (index_mode == "CPU" || index_mode == "cpu") ? knowhere::IndexMode::MODE_CPU
+                                                                : knowhere::IndexMode::MODE_GPU;
         } else {
             mode = knowhere::IndexMode::MODE_CPU;
         }

internal/core/unittest/test_c_api.cpp

@@ -259,8 +259,8 @@ TEST(CApiTest, DeleteTest) {
     auto collection = NewCollection(get_default_schema_config());
     auto segment = NewSegment(collection, Growing, -1);
 
-    long delete_row_ids[] = {100000, 100001, 100002};
-    unsigned long delete_timestamps[] = {0, 0, 0};
+    int64_t delete_row_ids[] = {100000, 100001, 100002};
+    uint64_t delete_timestamps[] = {0, 0, 0};
 
     auto offset = PreDelete(segment, 3);
 
@@ -635,8 +635,8 @@ TEST(CApiTest, GetDeletedCountTest) {
     auto collection = NewCollection(get_default_schema_config());
     auto segment = NewSegment(collection, Growing, -1);
 
-    long delete_row_ids[] = {100000, 100001, 100002};
-    unsigned long delete_timestamps[] = {0, 0, 0};
+    int64_t delete_row_ids[] = {100000, 100001, 100002};
+    uint64_t delete_timestamps[] = {0, 0, 0};
 
     auto offset = PreDelete(segment, 3);