builder progress (attribute, object and constraint class in todo.md)

source/orm/query/builder.cpp

@@ -2,11 +2,17 @@
 
 namespace matador::query {
 
-column_builder::column_builder(std::string column_name)
-: column_name( std::move(column_name) ) {}
+column_builder::column_builder(std::string column_name, const utils::basic_type type, const size_t size)
+: column_name_(std::move(column_name))
+, type_(type){}
 
 column_builder::operator class query::column() const {
-  return {column_name};
+  return {column_name_};
+}
+
+column_builder& column_builder::not_null() {
+
+    return *this;
 }
 
 table_builder::table_builder(std::string name)
@@ -55,8 +61,8 @@ table_builder table( std::string name ) {
 return table_builder(std::move(name));
 }
 
-column_builder column( std::string name ) {
-  return column_builder(std::move(name));
+column_builder column(std::string name, const utils::basic_type type, size_t size) {
+  return column_builder(std::move(name), type, size);
 }
 
 }