[jira] [Created] (ARROW-15175) MurmurHasher doesn't take the final bytes into account if size % 4 != 0

[James Henderson (Jira)]

James Henderson created ARROW-15175:
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             Summary: MurmurHasher doesn't take the final bytes into account if 
size % 4 != 0
                 Key: ARROW-15175
                 URL: https://issues.apache.org/jira/browse/ARROW-15175
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java
    Affects Versions: 6.0.1
            Reporter: James Henderson


Repro (for example): all buffers of size 1 hash to the same value (-1684229222)

To my untrained eye, it looks like 
[https://github.com/apache/arrow/blob/c9588c54a1264ce02abc70cd02486966a1e97acf/java/memory/memory-core/src/main/java/org/apache/arrow/memory/util/hash/MurmurHasher.java#L99]
 should range from `length - 1` rather than `index - 1`?



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