[jira] [Created] (SPARK-19940) FPGrowthModel.transform should skip duplicated items

["Maciej Szymkiewicz (JIRA)" <ji...@apache.org>]

Maciej Szymkiewicz created SPARK-19940:
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             Summary: FPGrowthModel.transform should skip duplicated items
                 Key: SPARK-19940
                 URL: https://issues.apache.org/jira/browse/SPARK-19940
             Project: Spark
          Issue Type: Bug
          Components: ML
    Affects Versions: 2.2.0
            Reporter: Maciej Szymkiewicz
            Priority: Minor


Due to misplaced {{distinct}} {{FPGrowthModel.transform} generates duplicated items in the "prediction":

{code}
scala> val data = spark.read.text("data/mllib/sample_fpgrowth.txt").select(split($"value", "\\s+").alias("features")) 
data: org.apache.spark.sql.DataFrame = [features: array<string>]

scala> val data = spark.read.text("data/mllib/sample_fpgrowth.txt").select(split($"value", "\\s+").alias("features")) 
data: org.apache.spark.sql.DataFrame = [features: array<string>]

scala> fpm.transform(Seq(Array("t", "s")).toDF("features")).show(1, false)
+--------+---------------------+
|features|prediction           |
+--------+---------------------+
|[t, s]  |[y, x, z, x, y, x, z]|
+--------+---------------------+

{code}



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