ulysses-you commented on a change in pull request #14762:
URL: https://github.com/apache/spark/pull/14762#discussion_r776914556
##########
File path:
common/unsafe/src/main/java/org/apache/spark/unsafe/array/ByteArrayMethods.java
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@@ -40,24 +40,41 @@ public static int roundNumberOfBytesToNearestWord(int
numBytes) {
}
}
+ private static final boolean unaligned = Platform.unaligned();
/**
* Optimized byte array equality check for byte arrays.
* @return true if the arrays are equal, false otherwise
*/
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;
+
+ // check if stars align and we can get both offsets to be aligned
+ if ((leftOffset % 8) == (rightOffset % 8)) {
Review comment:
I just consider it can avoid run `(leftOffset % 8) == (rightOffset % 8)`
and even `while ((leftOffset + i) % 8 != 0 && i < length) {` if we can break
the branch fast since most Platform is unaligned.
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