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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1614) Add next() and skipTo() variants to DocIdSetIterator that return the current doc, instead of boolean
Date Mon, 01 Jun 2009 14:55:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715104#action_12715104
] 

Shai Erera commented on LUCENE-1614:
------------------------------------

bq. So I think the solution is to make sure Scorers which do not have a nextDoc() should not
be passed to CS in the first place. And remove this check from CS ctor.

I'm afraid that's impossible too, since CS advances all Scorers in its ctor to the first agreed-upon
doc ID, which may result in NO_MORE_DOCS right upfront.

What if we document that you shouldn't call nextDoc() after it return NO_MORE_DOCS for now,
and then maybe we do proceed (in another issue) with the DISI.start() method. Then CS can
implement start() and return false if there are no more docs?

I also tried changing BS2.score(Collector) to first check the docID of countingSumScorer,
but that is not good either, since a Scorer is allowed to return -1 or NO_MORE_DOCS before
nextDoc() was called ...

What do you think?

> Add next() and skipTo() variants to DocIdSetIterator that return the current doc, instead
of boolean
> ----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1614
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1614
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Shai Erera
>             Fix For: 2.9
>
>         Attachments: LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch,
LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch,
LUCENE-1614.patch
>
>
> See http://www.nabble.com/Another-possible-optimization---now-in-DocIdSetIterator-p23223319.html
for the full discussion. The basic idea is to add variants to those two methods that return
the current doc they are at, to save successive calls to doc(). If there are no more docs,
return -1. A summary of what was discussed so far:
> # Deprecate those two methods.
> # Add nextDoc() and skipToDoc(int) that return doc, with default impl in DISI (calls
next() and skipTo() respectively, and will be changed to abstract in 3.0).
> #* I actually would like to propose an alternative to the names: advance() and advance(int)
- the first advances by one, the second advances to target.
> # Wherever these are used, do something like '(doc = advance()) >= 0' instead of comparing
to -1 for improved performance.
> I will post a patch shortly

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