Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8122#discussion_r36899421
--- Diff: unsafe/src/main/java/org/apache/spark/unsafe/types/ByteArray.java
---
@@ -29,4 +31,45 @@
public static void writeToMemory(byte[] src, Object target, long
targetOffset) {
Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET, target,
targetOffset, src.length);
}
+
+ /**
+ * Returns a 64-bit integer that can be used as the prefix used in
sorting.
+ */
+ public static long getPrefix(byte[] bytes) {
+ if (bytes == null) {
+ return 0L;
+ } else {
+ final int minLen = Math.min(bytes.length, 8);
+ long p = 0;
+ for (int i = 0; i < minLen; ++i) {
+ p |= (128L + Platform.getByte(bytes, Platform.BYTE_ARRAY_OFFSET +
i))
+ << (56 - 8 * i);
+ }
+ return p;
+ }
+ }
+
+ public static byte[] subStringSQL(byte[] bytes, int pos, int len) {
+ // This pos calculation is according to UTF8String#subStringSQL
+ if (pos > bytes.length) {
+ return new byte[0];
--- End diff --
can we reuse an empty array?
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