use raw pointer of table in class column (progress, needs fixes in tests)

include/matador/query/column.hpp

@@ -19,8 +19,7 @@ public:
   column(const char *name, const std::string& as = ""); // NOLINT(*-explicit-constructor)
   column(std::string name, std::string as = ""); // NOLINT(*-explicit-constructor)
   column(sql::sql_function_t func, std::string name);
-  // column(const class table &tab, std::string name, std::string as = "");
-  column(const std::shared_ptr<table> &t, std::string name, std::string as = "");
+  column(const class table* tab, std::string name, std::string as = "");
 
   [[nodiscard]] bool equals(const column &x) const;
 
@@ -36,14 +35,14 @@ public:
   [[nodiscard]] sql::sql_function_t function() const;
   [[nodiscard]] bool has_alias() const;
 
-  [[nodiscard]] std::shared_ptr<class table> table() const;
-  void table(const std::shared_ptr<query::table>& t);
+  [[nodiscard]] const class table* table() const;
+  void table(const query::table* t);
 
   // ReSharper disable once CppNonExplicitConversionOperator
   operator const std::string&() const; // NOLINT(*-explicit-constructor)
 
 private:
-  std::shared_ptr<query::table> table_;
+  const query::table* table_{nullptr};
   std::string name_;
   std::string alias_;
   utils::basic_type type_{utils::basic_type::Unknown};

include/matador/query/join_data.hpp

@@ -10,7 +10,7 @@
 namespace matador::query {
 
 struct join_data {
-  std::shared_ptr<table> join_table;
+  table* join_table{nullptr};
   std::unique_ptr<abstract_criteria> condition;
 };