system.events and system.metrics tables add column name as an alias to event and metric

src/Storages/System/StorageSystemEvents.cpp

@@ -16,6 +16,13 @@ NamesAndTypesList StorageSystemEvents::getNamesAndTypes()
     };
 }
 
+NamesAndAliases StorageSystemEvents::getNamesAndAliases()
+{
+    return {
+        {"name", std::make_shared<DataTypeString>(), "event"}
+    };
+}
+
 void StorageSystemEvents::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
     for (ProfileEvents::Event i = ProfileEvents::Event(0), end = ProfileEvents::end(); i < end; ++i)

src/Storages/System/StorageSystemEvents.h

@@ -17,6 +17,7 @@ public:
 
     static NamesAndTypesList getNamesAndTypes();
 
+    static NamesAndAliases getNamesAndAliases();
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 

src/Storages/System/StorageSystemMetrics.cpp

@@ -17,6 +17,13 @@ NamesAndTypesList StorageSystemMetrics::getNamesAndTypes()
     };
 }
 
+NamesAndAliases StorageSystemMetrics::getNamesAndAliases()
+{
+    return {
+        {"name", std::make_shared<DataTypeString>(), "metric"}
+    };
+}
+
 void StorageSystemMetrics::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)

src/Storages/System/StorageSystemMetrics.h

@@ -18,6 +18,7 @@ public:
 
     static NamesAndTypesList getNamesAndTypes();
 
+    static NamesAndAliases getNamesAndAliases();
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;