Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/12640#discussion_r61486213 --- 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 -- @mengxr We only use off-heap memory (direct buffer) for page (tens of MB), otherwise always use on-heap arrays. Off heap memory may be less efficient to handle smaller allocates.
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