Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17874#discussion_r115204690
--- Diff: mllib/src/test/scala/org/apache/spark/ml/fpm/FPGrowthSuite.scala
---
@@ -83,7 +83,7 @@ class FPGrowthSuite extends SparkFunSuite with
MLlibTestSparkContext with Defaul
)).toDF("id", "items")
val model = new FPGrowth().setMinSupport(0.7).fit(dataset)
val prediction = model.transform(df)
-
assert(prediction.select("prediction").where("id=3").first().getSeq[String](0).isEmpty)
+
assert(prediction.where("id=3").select("prediction").first().getSeq[String](0).isEmpty)
--- End diff --
I'm worried that existing spark applications may already use this pattern
in the code, so no matter it's a bug or not, it seems a feature now and we
can't break it...
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