val totalsAndProds = transByProd.leftOuterJoin(products)
println(totalsAndProds.first())

(19,([Ljava.lang.String;@261ea657,Some([Ljava.lang.String;@25290bca)))

totalsAndProds.filter(x => x._2 == Some).first

Exception in thread "main" java.lang.UnsupportedOperationException: empty collection
    at org.apache.spark.rdd.RDD$$anonfun$first$1.apply(RDD.scala:1380)
    at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
    at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
    at org.apache.spark.rdd.RDD.withScope(RDD.scala:363)
    at org.apache.spark.rdd.RDD.first(RDD.scala:1377)
    at com.example.spark.WordCount$.main(WordCount.scala:98)
    at com.example.spark.WordCount.main(WordCount.scala)

totalsAndProds.filter{ case (_, (_, s)) => s.isDefined }