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I loaded a JSON document in Spark, roughly, it looks like:

 |-- datasetid: string (nullable = true)
 |-- fields: struct (nullable = true)
 |    |-- type_description: string (nullable = true)

My DF is turning it into:

df = df.withColumn("desc", df.col("fields.type_description"));

All fine, but type_description's value looks like: "1 - My description type".

Ideally, I'd like my df to contain only the textual part, e.g. "My description type". I know how to do that, but how can I make it through Spark?

I was hoping some along the line of:

df = df.withColumn("desc", df.col("fields.type_description").call(/* some kind of transformation class / method*/));


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