How to create an edge list using a column of node path of ArrayType in Spark?

I have a Spark Dataset containing a single column of ArrayType which denotes the path from one user to another through their mutual friends

What I would like to achieve in the end is a table that explicitly lists the edges in the paths. (i.e. an edgelist)

How should I go about trying to transform the former table into the latter one?

You can turn each list to list of edges (pairs) by using arrays_zip on two slices - one w/o the last element and one w/o the first element. It will create array of structs, then explode resulting array to have each struct in a separate row and then turn struct column into two separate columns (withColumn). Then you should add reverse nodes and remove duplicates by using distinct.

I assume that you work with DataFrame and use spark sql functions.