removed sql statement from execute result

src/sql/connection.cpp

@@ -76,10 +76,10 @@ bool connection::exists(const std::string &table_name) const
   return connection_->exists(table_name);
 }
 
-std::pair<size_t, std::string> connection::execute(const std::string &sql) const
+size_t connection::execute(const std::string &sql) const
 {
   logger_.debug(sql);
-  return {connection_->execute(sql), sql};
+  return connection_->execute(sql);
 }
 
 std::unique_ptr<query_result_impl> connection::fetch(const std::string &sql) const

src/sql/query_intermediates.cpp

@@ -103,7 +103,7 @@ query_into_intermediate query_insert_intermediate::into(const std::string &table
   return {session_, builder_.into(table, column_names)};
 }
 
-std::pair<size_t, std::string> query_execute_finish::execute()
+size_t query_execute_finish::execute()
 {
   return session_.execute(builder_.compile().sql);
 }

src/sql/session.cpp

@@ -65,7 +65,7 @@ query_result<record> session::fetch(const query_context &q) const
 //  return query_result<record>(std::unique_ptr());
 //}
 
-std::pair<size_t, std::string> session::execute(const std::string &sql) const {
+size_t session::execute(const std::string &sql) const {
   auto c = pool_.acquire();
   if (!c.valid()) {
     throw std::logic_error("no database connection available");