feat(hyperloglog): add support of the Hyperloglog data structure

src/storage/redis_db.cc

@@ -99,10 +99,18 @@ rocksdb::Status Database::GetMetadata(RedisTypes types, const Slice &ns_key, std
 }
 
 rocksdb::Status Database::GetRawMetadata(const Slice &ns_key, std::string *bytes) {
+  return getRaw(ns_key, bytes);
+}
+
+rocksdb::Status Database::GetRawData(const Slice &key, std::string *bytes) {
+  return getRaw(key, bytes);
+}
+
+rocksdb::Status Database::getRaw(const Slice &key, std::string *bytes) {
   LatestSnapShot ss(storage_);
   rocksdb::ReadOptions read_options;
   read_options.snapshot = ss.GetSnapShot();
-  return storage_->Get(read_options, metadata_cf_handle_, ns_key, bytes);
+  return storage_->Get(read_options, metadata_cf_handle_, key, bytes);
 }
 
 rocksdb::Status Database::Expire(const Slice &user_key, uint64_t timestamp) {

src/storage/redis_db.h

@@ -39,6 +39,7 @@ class Database {
   [[nodiscard]] rocksdb::Status GetMetadata(RedisTypes types, const Slice &ns_key, std::string *raw_value,
                                             Metadata *metadata, Slice *rest);
   [[nodiscard]] rocksdb::Status GetRawMetadata(const Slice &ns_key, std::string *bytes);
+  [[nodiscard]] rocksdb::Status GetRawData(const Slice &ns_key, std::string *bytes);
   [[nodiscard]] rocksdb::Status Expire(const Slice &user_key, uint64_t timestamp);
   [[nodiscard]] rocksdb::Status Del(const Slice &user_key);
   [[nodiscard]] rocksdb::Status MDel(const std::vector<Slice> &keys, uint64_t *deleted_cnt);
@@ -63,6 +64,9 @@ class Database {
   [[nodiscard]] rocksdb::Status KeyExist(const std::string &key);
   [[nodiscard]] rocksdb::Status Rename(const std::string &key, const std::string &new_key, bool nx, bool *ret);
 
+ private:
+  rocksdb::Status getRaw(const Slice &ns_key, std::string *bytes);
+
  protected:
   engine::Storage *storage_;
   rocksdb::ColumnFamilyHandle *metadata_cf_handle_;

src/storage/redis_metadata.h

@@ -50,6 +50,7 @@ enum RedisType : uint8_t {
   kRedisBloomFilter = 9,
   kRedisJson = 10,
   kRedisSearch = 11,
+  kRedisHyperloglog = 12,
 };
 
 struct RedisTypes {
@@ -329,3 +330,8 @@ class SearchMetadata : public Metadata {
   void Encode(std::string *dst) const override;
   rocksdb::Status Decode(Slice *input) override;
 };
+
+class HyperloglogMetadata: public Metadata {
+ public:
+  explicit HyperloglogMetadata(bool generate_version = true) : Metadata(kRedisHyperloglog, generate_version) {}
+};