amorynan commented on code in PR #22911:
URL: https://github.com/apache/doris/pull/22911#discussion_r1292655706
##########
be/src/vec/functions/function_json.cpp:
##########
@@ -936,6 +937,186 @@ class FunctionJsonValid : public IFunction {
}
};
+class FunctionJsonMergePreserve : public IFunction {
+public:
+ static constexpr auto name = "json_merge_preserve";
+ static FunctionPtr create() { return
std::make_shared<FunctionJsonMergePreserve>(); }
+
+ String get_name() const override { return name; }
+
+ size_t get_number_of_arguments() const override { return 0; }
+
+ bool is_variadic() const override { return true; }
+
+ DataTypePtr get_return_type_impl(const DataTypes& arguments) const
override {
+ return make_nullable(std::make_shared<DataTypeString>());
+ }
+
+ bool use_default_implementation_for_nulls() const override { return false;
}
+
+ rapidjson::Value* merge_list(std::vector<rapidjson::Value*> jsons,
+ rapidjson::Document::AllocatorType&
allocator) {
+ rapidjson::Value* result =
+
static_cast<rapidjson::Value*>(allocator.Malloc(sizeof(rapidjson::Value)));
+
+ (*result).SetArray();
+ for (auto json : jsons) {
+ if (json->IsArray()) {
+ for (auto itr = json->Begin(); itr != json->End(); itr++) {
+ rapidjson::Value* node = static_cast<rapidjson::Value*>(
+ allocator.Malloc(sizeof(rapidjson::Value)));
+ node->CopyFrom(*itr, allocator);
+ result->PushBack(*node, allocator);
+ }
+ } else {
+ rapidjson::Value* node =
+
static_cast<rapidjson::Value*>(allocator.Malloc(sizeof(rapidjson::Value)));
+ node->CopyFrom(*json, allocator);
+ result->PushBack(*node, allocator);
+ }
+ }
+ return result;
+ }
+
+ rapidjson::Value* merge_obejcts(std::vector<rapidjson::Value*> objs,
+ rapidjson::Document::AllocatorType&
allocator) {
+ rapidjson::Value* result =
+
static_cast<rapidjson::Value*>(allocator.Malloc(sizeof(rapidjson::Value)));
+ result->SetObject();
+ std::map<std::string, std::vector<rapidjson::Value*>> json_bucket;
+
+ for (rapidjson::Value* obj : objs) {
+ for (auto itr = obj->MemberBegin(); itr != obj->MemberEnd();
++itr) {
+ if (json_bucket.find(itr->name.GetString()) !=
json_bucket.end()) {
+
json_bucket[itr->name.GetString()].push_back(&(itr->value));
+ } else {
+ std::vector<rapidjson::Value*> jsons;
+ jsons.push_back(&(itr->value));
+ json_bucket[itr->name.GetString()] = jsons;
+ }
+ }
+ }
+
+ for (auto itr = json_bucket.begin(); itr != json_bucket.end(); itr++) {
+ auto value = merge_jsons(itr->second, allocator);
+ result->AddMember(rapidjson::Value(itr->first.c_str(), allocator),
*value, allocator);
+ }
+ return result;
+ }
+
+ rapidjson::Value* merge_jsons(std::vector<rapidjson::Value*> jsons,
+ rapidjson::Document::AllocatorType&
allocator) {
+ rapidjson::Value* result =
+
static_cast<rapidjson::Value*>(allocator.Malloc(sizeof(rapidjson::Value)));
+
+ if (jsons.empty()) {
+ return result;
+ }
+
+ if (jsons.size() == 1) {
+ return jsons.at(0);
Review Comment:
just jsons[0] is ok
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