added type setter to column

include/matador/sql/column.hpp

@@ -50,6 +50,7 @@ public:
   [[nodiscard]] const std::string& ref_table() const;
   [[nodiscard]] const std::string& ref_column() const;
 
+  void type(data_type_t type);
   void alias(const std::string &as);
 
   template< typename Type >

src/sql/column.cpp

@@ -68,6 +68,11 @@ const std::string &column::ref_column() const
   return ref_column_;
 }
 
+void column::type(data_type_t type)
+{
+  type_ = type;
+}
+
 void column::alias(const std::string &as)
 {
   alias_ = as;