Remove unnecessary codes

core/src/main/scala/org/apache/spark/util/Distribution.scala

@@ -20,7 +20,6 @@ package org.apache.spark.util
 import java.io.PrintStream
 
 import scala.collection.immutable.IndexedSeq
-import scala.collection.mutable.ArrayBuffer
 
 /**
  * Util for getting some stats from a small sample of numeric values, with some handy
@@ -68,34 +67,6 @@ private[spark] class Distribution(val data: Array[Double], val startIdx: Int, va
     out.println(statCounter)
     showQuantiles(out)
   }
-
-  def histogram(bins: Int): Seq[(Double, Int)] = {
-    require(bins > 0)
-    val stat = statCounter
-    val binSize = (stat.max - stat.min) / (bins - 1)
-    val points = new Array[Double](bins)
-    for (i <- 0 until (bins - 1)) {
-      points(i) = stat.min + binSize * i
-    }
-    points(bins - 1) = stat.max
-    val counts = new Array[Int](bins)
-    for (i <- startIdx until endIdx) {
-      val v = data(i)
-      var j = 0
-      var find = false
-      while (!find && j < bins - 1) {
-        if (v < points(j) + binSize / 2) {
-          counts(j) += 1
-          find = true
-        }
-        j += 1
-      }
-      if (!find) {
-        counts(bins - 1) += 1
-      }
-    }
-    points.zip(counts)
-  }
 }
 
 private[spark] object Distribution {