sherman commented on issue #3139:
URL: https://github.com/apache/parquet-java/issues/3139#issuecomment-2622247352
Hi, @gszadovszky !
Yes, you're absolutely right. The situation is a bit more complex, but I see
a potential workaround.
Inside the JDK, there's a class called *ArraysSupport*, which provides the
*vectorizedHashCode* method that we need. This method also supports additional
arguments, such as *offset* and *len*, allowing it to work with array slices.
### The Problem
The ArraysSupport class is located in a module that is not exported by
default. However, we can still access it by adding an extra export directive to
the compiler:
```
--add-exports=java.base/jdk.internal.util=ALL-UNNAMED
```
Alternatively, a reference to the class can be obtained via a method handle.
The final implementation might look something like this:
```java
public static int hashCode(byte[] array, int offset, int length) throws
Throwable {
var len = Math.max(0, length - offset);
return switch (len) {
case 0 -> 1;
case 1 -> 31 + (int) array[0];
default -> ArraysSupport.vectorizedHashCode(array, 0, array.length,
1, ArraysSupport.T_BYTE);
};
}
```
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