match vertex by id, label and from main vertex store

include/query_engine/code_generator/handlers/return.hpp

@@ -38,6 +38,7 @@ auto return_query_action =
                     code += code_line(code::write_all_edges, entity);
 
             }
+            // the client will receive entities from label index
             if (cypher_data.source(entity) == EntitySource::LabelIndex)
             {
                 if (cypher_data.type(entity) == EntityType::Node) {
@@ -47,7 +48,6 @@ auto return_query_action =
                     code += code_line(code::fine_and_write_vertices_by_label,
                                       entity, label);
                 }
-                // TODO: code_line
             }
         } 
         else if (element.is_projection()) 

include/query_engine/query_engine.hpp

@@ -36,7 +36,8 @@ public:
         } catch (QueryEngineException &e) {
             // in this case something fatal went wrong
             logger.error("QueryEngineException: {}", std::string(e.what()));
-            return false;
+            // return false;
+            throw e;
         }
     }
 

include/query_engine/traverser/code.hpp

@@ -74,12 +74,12 @@ const std::string write_all_vertices =
 const std::string fine_and_write_vertices_by_label =
         "auto &label = t.label_find_or_create(\"{1}\");\n"
         "        stream.write_field(\"{0}\");\n"
-        "        label.index().for_range(t).for_all([&](auto vertex) {\n"
+        "        label.index().for_range(t)->for_all([&](auto vertex) {{\n"
         "            stream.write_record();\n"
         "            stream.write_list_header(1);\n"
         "            stream.write(vertex);\n"
         "            stream.chunk();\n"
-        "        });\n"
+        "        }});\n"
         "        stream.write_meta(\"rw\");\n";
 
 const std::string write_all_edges =

include/query_engine/traverser/cpp_traverser.hpp

@@ -3,12 +3,12 @@
 #include <string>
 
 #include "cypher/visitor/traverser.hpp"
-
 #include "query_engine/code_generator/cpp_generator.hpp"
 #include "query_engine/code_generator/entity_search.hpp"
 #include "query_engine/code_generator/structures.hpp"
 #include "query_engine/exceptions/exceptions.hpp"
 #include "query_engine/traverser/code.hpp"
+#include "logging/default.hpp"
 
 struct SetElementState
 {
@@ -99,7 +99,11 @@ private:
         generator.clear();
     }
 
+    Logger logger;
+
 public:
+    CppTraverser() : logger(logging::log->logger("CppTraverser")) {}
+
     void semantic_check() const
     {
         if (!has_return)

src/communication/bolt/v1/states/executor.cpp

@@ -61,9 +61,11 @@ void Executor::run(Session& session, Query& query)
     auto &db = session.active_db();
     logger.debug("[ActiveDB] '{}'", db.name());
 
-    // TODO: error handling
-
-    query_engine.execute(query.statement, db, session.output_stream);
+    try {
+        query_engine.execute(query.statement, db, session.output_stream);
+    } catch (QueryEngineException &e) {
+        // return error to user
+    }
 }
 
 void Executor::pull_all(Session& session)