Create spark dataframe schema from json schema representation
<p>Is there a way to serialize a dataframe schema to json and deserialize it later on?</p>

<p>The use case is simple: 
I have a json configuration file which contains the schema for dataframes I need to read.
I want to be able to create the default configuration from an existing schema (in a dataframe) and I want to be able to generate the relevant schema to be used later on by reading it from the json string.</p>