feat(db): add meta impl factory

Former-commit-id: e9af01dea914b32192efe1c534e174810be5a02a

cpp/src/db/Factories.cpp

@@ -34,6 +34,11 @@ Options OptionsFactory::Build() {
     return options;
 }
 
+std::shared_ptr<meta::DBMetaImpl> DBMetaImplFactory::Build() {
+    DBMetaOptions options = DBMetaOptionsFactory::Build();
+    return std::shared_ptr<meta::DBMetaImpl>(new meta::DBMetaImpl(options));
+}
+
 } // namespace engine
 } // namespace vecwise
 } // namespace zilliz

cpp/src/db/Factories.h

@@ -7,7 +7,9 @@
 #pragma once
 
 #include <string>
+#include <memory>
 #include "db/DB.h"
+#include "DBMetaImpl.h"
 
 namespace zilliz {
 namespace vecwise {
@@ -21,6 +23,9 @@ struct OptionsFactory {
     static Options Build();
 };
 
+struct DBMetaImplFactory {
+    static std::shared_ptr<meta::DBMetaImpl> Build();
+};
 
 } // namespace engine
 } // namespace vecwise