lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Uwe Schindler (Updated) (JIRA)" <j...@apache.org>
Subject [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
Date Sat, 19 Nov 2011 11:16:51 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-3582:
----------------------------------

    Attachment:     (was: LUCENE-3582.patch)
    
> 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, 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...).

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message