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https://issues.apache.org/jira/browse/LUCENE-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723511#action_12723511
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Michael McCandless commented on LUCENE-1652:
--------------------------------------------
I think TopScorer is the only possibility... but let's hold off on that for
now? The only other things I see was maybe adding a DISI.start/done, but I
think we should hold off on that too? So I'll resolve this on as invalid...
> Enhancements to Scorers following the changes to DocIdSetIterator
> -----------------------------------------------------------------
>
> Key: LUCENE-1652
> URL: https://issues.apache.org/jira/browse/LUCENE-1652
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Shai Erera
> Fix For: 3.0
>
>
> In LUCENE-1614, we changed the semantics of DocIdSetIterator's methods to
> return a sentinel NO_MORE_DOCS (= Integer.MAX_VALUE) when the iterator has
> exhausted. Due to backward compatibility issues, we couldn't implement that
> semantics in doc(). Therefore this issue, which can be introduced in 3.0 only
> will:
> # Implement the new semantics in all extending classes, such that doc() will
> return NO_MORE_DOCS when the iterator has exhausted.
> # Change BooleanScorer to take advantage of that by removing sub.done from
> SubScorer and operate under the assumption that NO_MORE_DOCS is larger than
> any doc ID (Integer.MAX_VALUE).
> # Change ConjunctionScorer to operate under the same assumptions and remove
> 'more'.
> # Change ReqExclScorer to not rely on reqScorer in doc(), since the latter
> may be null.
> # Make more changes to ConjunctionScorer's init() and remove 'firstTime' to
> improve the performance of nextDoc(), score(), advance().
> # Add start()/finish() to DISI?
> A snippet from LUCENE-1614 regarding the change in BooleanScorer
> {code}
> int doc = sub.done ? -1 : scorer.doc();
> while (!sub.done && doc < end) {
> sub.collector.collect(doc);
> doc = scorer.nextDoc();
> sub.done = doc < 0;
> }
> {code}
> To this:
> {code}
> int doc = scorer.doc();
> while (doc < end) {
> sub.collector.collect(doc);
> doc = scorer.nextDoc();
> }
> {code}
> And in ConjunctionScorer, change this:
> {code}
> while (more && (firstScorer=scorers[first]).doc() <
> (lastDoc=lastScorer.doc())) {
> more = firstScorer.advance(lastDoc) >= 0;
> lastScorer = firstScorer;
> first = (first == (scorers.length-1)) ? 0 : first+1;
> }
> return more;
> {code}
> To this:
> {code}
> while ((firstScorer=scorers[first]).doc() < (lastDoc=lastScorer.doc())) {
> firstScorer.advance(lastDoc);
> lastScorer = firstScorer;
> first = (first == (scorers.length-1)) ? 0 : first+1;
> }
> return lastDoc != DOC_SENTINEL;
> {code}
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