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

    https://github.com/apache/spark/pull/12640#discussion_r61542453
  
    --- Diff: 
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeArrayData.java
 ---
    @@ -336,4 +336,62 @@ public UnsafeArrayData copy() {
         arrayCopy.pointTo(arrayDataCopy, Platform.BYTE_ARRAY_OFFSET, 
sizeInBytes);
         return arrayCopy;
       }
    +
    +  public int[] toPrimitiveIntArray() {
    +    int[] result = new int[numElements];
    +    Platform.copyMemory(baseObject, baseOffset + 4 + 4 * numElements,
    +      result, Platform.INT_ARRAY_OFFSET, 4 * numElements);
    +    return result;
    +  }
    +
    +  public double[] toPrimitiveDoubleArray() {
    +    double[] result = new double[numElements];
    +    Platform.copyMemory(baseObject, baseOffset + 4 + 4 * numElements,
    +      result, Platform.DOUBLE_ARRAY_OFFSET, 8 * numElements);
    +    return result;
    +  }
    +
    +  public static UnsafeArrayData fromPrimitiveArray(int[] arr) {
    +    int offsetRegionSize = 4 * arr.length;
    +    int valueRegionSize = 4 * arr.length;
    +    int totalSize = 4 + offsetRegionSize + valueRegionSize;
    +    byte[] data = new byte[totalSize];
    --- End diff --
    
    +1


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