Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17130#discussion_r103822448
--- Diff: mllib/src/main/scala/org/apache/spark/ml/fpm/FPGrowth.scala ---
@@ -240,12 +240,13 @@ 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))) {
+ brRules.value.flatMap { rule =>
--- End diff --
Nit, while we're here -- why change this bit?
Or if simplifying, what about
```
brRules.value.filter(_._1_forall(itemset.contains)).flatMap(_._2.filter(!itemset.contains(_)))
```
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