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https://issues.apache.org/jira/browse/LUCENE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-3179:
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Attachment: LUCENE-3179-fix.patch
Yonik mentioned on mailing list that prevSetBit is broken for size==0 and also
indexes >= size. In that case you always get AIOOBE or even wrong results. In
the case of an index >= the length of the bitset, the scanning must start at
the last possible bit, so subIndex must be 0x3f and not simply the anded bits.
This is my naive fix. Tests pass (I added a extra check to the test that start
beyond end of bitset to check prevSetBit).
> OpenBitSet.prevSetBit()
> -----------------------
>
> Key: LUCENE-3179
> URL: https://issues.apache.org/jira/browse/LUCENE-3179
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Paul Elschot
> Priority: Minor
> Fix For: 3.3, 4.0
>
> Attachments: LUCENE-3179-fix.patch, LUCENE-3179.patch,
> LUCENE-3179.patch, LUCENE-3179.patch, TestBitUtil.java, TestOpenBitSet.patch
>
>
> Find a previous set bit in an OpenBitSet.
> Useful for parent testing in nested document query execution LUCENE-2454 .
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