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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-520) Ability to abort hit collection
Date Thu, 16 Mar 2006 17:21:09 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-520?page=comments#action_12370719 ] 

Doug Cutting commented on LUCENE-520:
-------------------------------------

Jeremy: Have you tested that scorer.skipTo(Integer.MAX_VALUE) actually works?  It might, but
it also might not, depending on how much state is cached on the stack.

For what it's worth, a few months ago I tried to change HitCollector to return a boolean that
would stop things, but I couldn't figure out a simple way to make it work. I think my plan
was (for back-compatibility) to add a new HitCollector method, isCollected(), that returned
a boolean, then change all of the scorer implementations to call isCollected(), and make the
default implementation of isCollected() call collect(), for back-compatibility.   I don't
remember the details, but it was much harder than I thought it would be to make this work.
 So I ended up throwing an Exception, which is not ideal.

> Ability to abort hit collection
> -------------------------------
>
>          Key: LUCENE-520
>          URL: http://issues.apache.org/jira/browse/LUCENE-520
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Search
>     Versions: 1.9
>     Reporter: Eric Jain
>     Priority: Minor

>
> If the HitCollector.collect method returned a boolean value rather than void, this value
could be used to determine whether any further hits should be reported. This would speed up
things a bit when all you need is a confirmation that a query produces some hits (e.g. for
generating suggestions).

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