the scheme in stream reader

[??????????]

Hi all,


L set the scheme for  DataStreamReader but when I print the scheme.It just 
printed:
root
|--value:string (nullable=true)


My code is


val line = ss.readStream.format("socket")
.option("ip",xxx)
.option("port",xxx)
.scheme(StructField("name",StringType??::(StructField("age", IntegerType))).load
line.printSchema


My spark version is 2.1.0.
I want the printSchema prints the schema I set in the code.How should I do 
please?
And my original target is the received data from socket is handled as schema 
directly.What should I do please?


thanks
Fei Shao