removed sql statement from execute result

include/matador/sql/connection.hpp

@@ -35,7 +35,7 @@ public:
   [[nodiscard]] bool exists(const std::string &table_name) const;
 
   [[nodiscard]] std::unique_ptr<query_result_impl> fetch(const std::string &sql) const;
-  [[nodiscard]] std::pair<size_t, std::string> execute(const std::string &sql) const;
+  [[nodiscard]] size_t execute(const std::string &sql) const;
 
   statement prepare(query_context &&query) const;
 

include/matador/sql/query_intermediates.hpp

@@ -36,7 +36,7 @@ class query_execute_finish : public query_intermediate
 public:
   using query_intermediate::query_intermediate;
 
-  std::pair<size_t, std::string> execute();
+  size_t execute();
   statement prepare();
 };
 

include/matador/sql/session.hpp

@@ -31,7 +31,7 @@ public:
 
   [[nodiscard]] query_result<record> fetch(const query_context &q) const;
 //  [[nodiscard]] query_result<record> fetch(const std::string &sql) const;
-  [[nodiscard]] std::pair<size_t, std::string> execute(const std::string &sql) const;
+  [[nodiscard]] size_t execute(const std::string &sql) const;
   statement prepare(query_context q) const;
 
   record describe_table(const std::string &table_name) const;