filter joins in scoobi are amazing

filterjoin.scala

    // deep joins are easy using scoobi.
    // for instance if you have a function that computes your most frequent queries in hadoop and you want to 
    // return only the search session objects (which could have tons of event data other than searches) 
    // that contain at least one of those queries you can do it  like this.
    
    val sessions_w_pop_queries = listOfPopQueries.join(sessions).filter {
      case (pop_queries, session) => session.justSearchPages.flatMap { _.keyword }.toSet.intersect(pop_queries).nonEmpty
    }.map { case (pop_queries, session) => session }