tivrfoa commented on a change in pull request #7487:
URL: https://github.com/apache/pinot/pull/7487#discussion_r719368071
##########
File path: pinot-spi/src/main/java/org/apache/pinot/spi/utils/ByteArray.java
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@@ -91,19 +115,55 @@ public int compareTo(@Nonnull ByteArray that) {
* <li> +ve integer if first value is larger than the second. </li>
* </ul>
*
- * @param bytes1 First byte[] to compare.
- * @param bytes2 Second byte[] to compare.
+ * @param left First byte[] to compare.
+ * @param right Second byte[] to compare.
* @return Result of comparison as stated above.
*/
- public static int compare(byte[] bytes1, byte[] bytes2) {
- int len1 = bytes1.length;
- int len2 = bytes2.length;
+ public static int compare(byte[] left, byte[] right) {
+ return compare(left, 0, left.length, right, 0, right.length);
+ }
+
+ /**
+ * Compares two byte[] values. The comparison performed is on unsigned value
for each byte.
+ * Returns:
+ * <ul>
+ * <li> 0 if both values are identical. </li>
+ * <li> -ve integer if first value is smaller than the second. </li>
+ * <li> +ve integer if first value is larger than the second. </li>
+ * </ul>
+ *
+ * @param left First byte[] to compare.
+ * @param leftFromIndex inclusive index of first byte to compare in left
+ * @param leftToIndex exclusive index of last byte to compare in left
+ * @param right Second byte[] to compare.
+ * @param rightFromIndex inclusive index of first byte to compare in right
+ * @param rightToIndex exclusive index of last byte to compare in right
+ * @return Result of comparison as stated above.
+ */
+ public static int compare(byte[] left, int leftFromIndex, int leftToIndex,
+ byte[] right, int rightFromIndex, int rightToIndex) {
+ if (COMPARE_UNSIGNED != null) {
Review comment:
Hi folks!
I was going to ask the question below, but then I understood why
MethodHandle lookup was used.
Very nice idea! Multi-release jar is very nice too! =)
---
Newbie question:<br>
I need to compile with java version >= 9 to use Arrays.compareUnsigned, but
if I run with Java 8 I get:<br>
```
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError:
JavaVersion has been compiled by a more recent version of the Java Runtime
(class file version 55.0), this version of the Java Runtime only recognizes
class file versions up to 52.0
or
bad class file: ./JavaVersion.class
class file has wrong version 55.0, should be 52.0
Please remove or make sure it appears in the correct subdirectory of the
classpath.
```
So what's the point to prepare the code for a previous version?<br>
ps: I'm sure I'm missing something. =D
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