Github user yanboliang commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15212#discussion_r84042900
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/ml/feature/ChiSqSelectorSuite.scala ---
    @@ -82,6 +82,18 @@ class ChiSqSelectorSuite extends SparkFunSuite with 
MLlibTestSparkContext
             case Row(vec1: Vector, vec2: Vector) =>
               assert(vec1 ~== vec2 absTol 1e-1)
           }
    +
    +    selector.setSelectorType("fwe").setAlpha(0.5).fit(df2).transform(df2)
    +      .select("filtered", "preFilteredData").collect().foreach {
    +      case Row(vec1: Vector, vec2: Vector) =>
    +        assert(vec1 ~== vec2 absTol 1e-1)
    +    }
    +
    +    selector.setSelectorType("fdr").setAlpha(0.21).fit(df2).transform(df2)
    +      .select("filtered", "preFilteredData").collect().foreach {
    +      case Row(vec1: Vector, vec2: Vector) =>
    +        assert(vec1 ~== vec2 absTol 1e-1)
    +    }
    --- End diff --
    
    Enforce this test case to large dimension data, and output different 
selected features according to selector type as far as possible.


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