Github user sumansomasundar commented on a diff in the pull request: https://github.com/apache/spark/pull/14762#discussion_r77755718 --- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/array/ByteArrayMethods.java --- @@ -47,13 +47,20 @@ public static int roundNumberOfBytesToNearestWord(int numBytes) { public static boolean arrayEquals( Object leftBase, long leftOffset, Object rightBase, long rightOffset, final long length) { int i = 0; - while (i <= length - 8) { - if (Platform.getLong(leftBase, leftOffset + i) != - Platform.getLong(rightBase, rightOffset + i)) { - return false; - } - i += 8; - } + + // This attempts to speed up the memcmp type of operation, but there is no way + // to guarantee that the offsets will be on a word boundary in order to use + // Platform.getLong --- End diff -- It can still be used only if both the leftOffset AND rightOffset start on proper word boundaries. By checking for these 2 conditions, we lose the advantage gained by this block.
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