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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-569) NearSpans skipTo bug
Date Tue, 16 May 2006 01:18:06 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-569?page=comments#action_12402471 ] 

Hoss Man commented on LUCENE-569:
---------------------------------


I tried to make sense of the existing NearSpans implimentation over the weekend ... i did
not succeed.  I still haven't had a cahnce to look at the new one in LUCENE-413 but i wnat
to clarify something you said..

>>> The NearSpansOrdered there differs from the current version in that it does not
>>> match overlapping subspans, but it passes all current test cases including TestNearSpans
here. 

...should I understand you to mean then that the current implimentaion of NearSpans does work
correctly with overlapping sub-spans ... there just isnt' a test for it?

that seems like important enough behavior that we wouldn't want to break it to fix this bug.

Even if matching on overlapping subspans wasn't an intentional feature of NearSpans -- the
fact that it currently works and the documentation is silent on the issue suggests to me that
it should remain supported.

> NearSpans skipTo bug
> --------------------
>
>          Key: LUCENE-569
>          URL: http://issues.apache.org/jira/browse/LUCENE-569
>      Project: Lucene - Java
>         Type: Bug

>   Components: Search
>     Reporter: Hoss Man
>  Attachments: TestNearSpans.java
>
> NearSpans appears to have a bug in skipTo that causes it to skip over some matching documents
completely.  I discovered this bug while investigating problems with SpanWeight.explain, but
as far as I can tell the Bug is not specific to Explanations ... it seems like it could potentially
result in incorrect matching in some situations where a SpanNearQuery is nested in another
query such thatskipTo will be used ... I tried to create a high level test case to exploit
the bug when searching, but i could not.  TestCase exploiting the class using NearSpan and
SpanScorer will follow...

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