drop unused code

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala

@@ -3986,81 +3986,6 @@ case class ArrayExcept(left: Expression, right: Expression) extends ArraySetLike
     left.dataType
   }
 
-  var hsInt: OpenHashSet[Int] = _
-  var hsLong: OpenHashSet[Long] = _
-
-  def assignInt(array: ArrayData, idx: Int, resultArray: ArrayData, pos: Int): Boolean = {
-    val elem = array.getInt(idx)
-    if (!hsInt.contains(elem)) {
-      if (resultArray != null) {
-        resultArray.setInt(pos, elem)
-      }
-      hsInt.add(elem)
-      true
-    } else {
-      false
-    }
-  }
-
-  def assignLong(array: ArrayData, idx: Int, resultArray: ArrayData, pos: Int): Boolean = {
-    val elem = array.getLong(idx)
-    if (!hsLong.contains(elem)) {
-      if (resultArray != null) {
-        resultArray.setLong(pos, elem)
-      }
-      hsLong.add(elem)
-      true
-    } else {
-      false
-    }
-  }
-
-  def evalIntLongPrimitiveType(
-      array1: ArrayData,
-      array2: ArrayData,
-      resultArray: ArrayData,
-      isLongType: Boolean): Int = {
-    // store elements into resultArray
-    var notFoundNullElement = true
-    var i = 0
-    while (i < array2.numElements()) {
-      if (array2.isNullAt(i)) {
-        notFoundNullElement = false
-      } else {
-        val assigned = if (!isLongType) {
-          hsInt.add(array2.getInt(i))
-        } else {
-          hsLong.add(array2.getLong(i))
-        }
-      }
-      i += 1
-    }
-    var pos = 0
-    i = 0
-    while (i < array1.numElements()) {
-      if (array1.isNullAt(i)) {
-        if (notFoundNullElement) {
-          if (resultArray != null) {
-            resultArray.setNullAt(pos)
-          }
-          pos += 1
-          notFoundNullElement = false
-        }
-      } else {
-        val assigned = if (!isLongType) {
-          assignInt(array1, i, resultArray, pos)
-        } else {
-          assignLong(array1, i, resultArray, pos)
-        }
-        if (assigned) {
-          pos += 1
-        }
-      }
-      i += 1
-    }
-    pos
-  }
-
   @transient lazy val evalExcept: (ArrayData, ArrayData) => ArrayData = {
     if (elementTypeSupportEquals) {
       (array1, array2) =>