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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1583) SpanOrQuery skipTo() doesn't always move forwards
Date Thu, 02 Apr 2009 14:01:13 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-1583:
---------------------------------------

    Fix Version/s: 2.9

LUCENE-1327 was a similar issue.

> SpanOrQuery skipTo() doesn't always move forwards
> -------------------------------------------------
>
>                 Key: LUCENE-1583
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1583
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1
>            Reporter: Moti Nisenson
>            Priority: Minor
>             Fix For: 2.9
>
>
> In SpanOrQuery the skipTo() method is improperly implemented if the target doc is less
than or equal to the current doc, since skipTo() may not be called for any of the clauses'
spans:
>     public boolean skipTo(int target) throws IOException {
>           if (queue == null) {
>             return initSpanQueue(target);
>           }
>           while (queue.size() != 0 && top().doc() < target) {
>             if (top().skipTo(target)) {
>               queue.adjustTop();
>             } else {
>               queue.pop();
>             }
>           }
>           
>         	return queue.size() != 0;
>         }
> This violates the correct behavior (as described in the Spans interface documentation),
that skipTo() should always move forwards, in other words the correct implementation would
be:
>     public boolean skipTo(int target) throws IOException {
>           if (queue == null) {
>             return initSpanQueue(target);
>           }
>           boolean skipCalled = false;
>           while (queue.size() != 0 && top().doc() < target) {
>             if (top().skipTo(target)) {
>               queue.adjustTop();
>             } else {
>               queue.pop();
>             }
>             skipCalled = true;
>           }
>           
>           if (skipCalled) {
>         	return queue.size() != 0;
>           }
>           return next();
>         }

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