I've a table with two columns: Author, Keywords.
My goal is to obtain the first 5 keywords most used by a single author, the column Keywords can be a list of the various keywords (with also repetition) or a simple String which has a coma as a separator.
How can I do it? There is any particular node or I have to create a Java Snippet?
I've tried with a node GroupBy trying to use in the options "Unique concatenate with count" as aggregation but it doesn't split by single words.