Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/17130#discussion_r113366111 --- Diff: mllib/src/main/scala/org/apache/spark/ml/fpm/FPGrowth.scala --- @@ -268,12 +269,8 @@ class FPGrowthModel private[ml] ( val predictUDF = udf((items: Seq[_]) => { if (items != null) { val itemset = items.toSet - brRules.value.flatMap(rule => - if (items != null && rule._1.forall(item => itemset.contains(item))) { - rule._2.filter(item => !itemset.contains(item)) - } else { - Seq.empty - }).distinct + brRules.value.filter(_._1.forall(itemset.contains)) + .flatMap(_._2.filter(!itemset.contains(_))).distinct --- End diff -- right, 2 things - first just calling out while the PR says doc changes there is this one code change here. second, before this code was checking `items != null` do we need not consider that now?
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