Optimize MySQL statement execute without parameters

ext/mysqlnd/mysqlnd_ps_codec.c

@@ -938,7 +938,7 @@ mysqlnd_stmt_execute_generate_request(MYSQLND_STMT * const s, zend_uchar ** requ
 	zend_uchar	*p = stmt->execute_cmd_buffer.buffer,
 				*cmd_buffer = stmt->execute_cmd_buffer.buffer;
 	size_t cmd_buffer_length = stmt->execute_cmd_buffer.length;
-	enum_func_status ret;
+	enum_func_status ret = PASS;
 
 	DBG_ENTER("mysqlnd_stmt_execute_generate_request");
 
@@ -955,7 +955,9 @@ mysqlnd_stmt_execute_generate_request(MYSQLND_STMT * const s, zend_uchar ** requ
 	int1store(p, 1); /* and send 1 for iteration count */
 	p+= 4;
 
-	ret = mysqlnd_stmt_execute_store_params(s, &cmd_buffer, &p, &cmd_buffer_length);
+	if (stmt->param_count != 0) {
+	    ret = mysqlnd_stmt_execute_store_params(s, &cmd_buffer, &p, &cmd_buffer_length);
+	}
 
 	*free_buffer = (cmd_buffer != stmt->execute_cmd_buffer.buffer);
 	*request_len = (p - cmd_buffer);