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XorBinaryFuse8 failed to construct on some data

See original GitHub issue

public static void main(String[] args) {
        int n = 500000;
        long[] keys = new long[n];
        for (int i = 0; i < n; i++) {
            keys[i] = i;
        }
        XorBinaryFuse8.construct(keys);
    }

Execute this code will report:

java.lang.ArrayIndexOutOfBoundsException: 500001

Is there any paper/draft can help understand xor binary fuse algorithm?

Issue Analytics

State:
Created 2 years ago
Comments:5 (4 by maintainers)

Top GitHub Comments

1reaction

thomasmuellercommented, Dec 16, 2021

paper/draft can help understand xor binary fuse algorithm?

Yes, here the paper that contains all the theory about the fuse approach: https://arxiv.org/abs/1907.04749 - it doesn’t describe the construction algorithm we use here I’m afraid, but it explains the theory.

0reactions

konghuarukhrcommented, Dec 19, 2021

I find it is not fixed, this is another construction failure:

    public static void main(String[] args) {
        int n = 11511;
        long[] keys = new long[n];
        for (int i = 0; i < n; i++) {
            keys[i] = i;
        }
        XorBinaryFuse8.construct(keys);
    }

will report:

...

11511 keys; arrayLength 14336 reverseOrderPos 6371
Exception in thread "main" java.lang.IllegalStateException
	at org.fastfilter.xor.XorBinaryFuse8.addAll(XorBinaryFuse8.java:219)