Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/17130#discussion_r114002784
--- 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 --
I guess that's the right way. I will revert the code change.
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