ensure proper table creation in session::create_schema including foreign key constraints

include/matador/sql/abstract_sql_logger.hpp

@@ -35,7 +35,7 @@ public:
   virtual void on_close() = 0;
 
   /**
-   * Is called when a sql statement is going to
+   * Is called when a SQL statement is going to
    * be executed
    *
    * @param stmt SQL statement to be executed
@@ -43,7 +43,15 @@ public:
   virtual void on_execute(const std::string &stmt) = 0;
 
   /**
-   * Is called when a sql statement is going to
+   * Is called when a SQL select statement is going to
+   * be executed
+   *
+   * @param stmt The SQL select-statement to be executed
+   */
+  virtual void on_fetch(const std::string &stmt) = 0;
+
+  /**
+   * Is called when a SQL statement is going to
    * be prepared
    *
    * @param stmt SQL statement to be prepared
@@ -75,6 +83,11 @@ public:
    */
   void on_execute(const std::string &) override { }
 
+  /**
+   * No logging on a select-statement.
+   */
+  void on_fetch( const std::string& stmt ) override { }
+
   /**
    * No logging on preparing a statement.
    */