has many fetch with join

source/orm/sql/query_result.cpp

@@ -5,12 +5,27 @@
 
 namespace matador::sql::detail {
 
+field_type determine_field_type(const utils::constraints c) {
+    if (is_constraint_set(c, utils::constraints::FOREIGN_KEY)) {
+        return field_type::ForeignKey;
+    }
+    if (is_constraint_set(c, utils::constraints::PRIMARY_KEY)) {
+        return field_type::PrimaryKey;
+    }
+    return field_type::Attribute;
+}
+
 template<>
-record *create_prototype<record>(const std::vector<object::attribute_definition> &prototype)
-{
+record *create_prototype<record>(const std::vector<object::attribute_definition> &prototype) {
   auto result = std::make_unique<record>();
   for (const auto &col: prototype) {
-    result->append({col.name(), col.type(), col.attributes().size(), col.index()});
+    result->append({
+        col.name(),
+        col.type(),
+        determine_field_type(col.attributes().options()),
+        col.attributes().size(),
+        col.index()
+    });
   }
   return result.release();
 }