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Date: Mon, 27 Sep 2010 00:08:33 -0400 (EDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Resolved: (LUCENE-2669)
 NumericRangeQuery.NumericRangeTermsEnum sometimes seeks backwards
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     [ https://issues.apache.org/jira/browse/LUCENE-2669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe Schindler resolved LUCENE-2669.
-----------------------------------

    Resolution: Fixed

Committed revision: 1001582

Thanks Mike for catching this!

> NumericRangeQuery.NumericRangeTermsEnum sometimes seeks backwards
> -----------------------------------------------------------------
>
>                 Key: LUCENE-2669
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2669
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Michael McCandless
>            Assignee: Uwe Schindler
>             Fix For: 4.0
>
>         Attachments: LUCENE-2669.patch, LUCENE-2669.patch, LUCENE-2669.patch
>
>
> Subclasses of FilteredTermsEnum are "supposed to" seek forwards only (this gives better performance, typically).
> However, we don't check for this, so I added an assert to do that (while digging into testing the SimpleText codec) and NumericRangeQuery trips the assert!
> Other MTQs seem not to trip it.
> I think I know what's happening -- say NRQ has term ranges a-c, e-f to seek to, but then while it's .next()'ing through the first range, the first term after c is f.  At this point NRQ sees the range a-c is done, and then tries to seek to term e which is before f.  Maybe NRQ's accept method should detect this case (where you've accidentally .next()'d into or possibly beyond the next one or more seek ranges)?

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