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Posted to dev@lucene.apache.org by "Uwe Schindler (Updated) (JIRA)" <ji...@apache.org> on 2011/11/19 11:52:51 UTC
[jira] [Updated] (LUCENE-3582)
NumericUtils.floatToSortableInt/doubleToSortableLong does not sort certain
NaN ranges correctly and NumericRangeQuery produces wrong results for NaNs
with half-open ranges
[ https://issues.apache.org/jira/browse/LUCENE-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler updated LUCENE-3582:
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Summary: NumericUtils.floatToSortableInt/doubleToSortableLong does not sort certain NaN ranges correctly and NumericRangeQuery produces wrong results for NaNs with half-open ranges (was: NumericUtils.floatToSortableInt does not sort certain NaN ranges correctly.)
> NumericUtils.floatToSortableInt/doubleToSortableLong does not sort certain NaN ranges correctly and NumericRangeQuery produces wrong results for NaNs with half-open ranges
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3582
> URL: https://issues.apache.org/jira/browse/LUCENE-3582
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Dawid Weiss
> Assignee: Uwe Schindler
> Priority: Trivial
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-3582.patch, LUCENE-3582.patch
>
>
> The current implementation of floatToSortableInt does not account for different NaN ranges which may result in NaNs sorted before -Infinity and after +Infinity. The default Java ordering is: all NaNs after Infinity.
> A possible fix is to make all NaNs canonic "quiet NaN" as in:
> {code}
> // Canonicalize NaN ranges. I assume this check will be faster here than
> // (v == v) == false on the FPU? We don't distinguish between different
> // flavors of NaNs here (see http://en.wikipedia.org/wiki/NaN). I guess
> // in Java this doesn't matter much anyway.
> if ((v & 0x7fffffff) > 0x7f800000) {
> // Apply the logic below to a canonical "quiet NaN"
> return 0x7fc00000 ^ 0x80000000;
> }
> {code}
> I don't commit because I don't know how much of the existing stuff relies on this (nobody should be keeping different NaNs in their indexes, but who knows...).
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