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https://issues.apache.org/jira/browse/LUCENE-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1614:
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Attachment: LUCENE-1614.patch
Patch is looking good!
OK I attached new patch... note that patch applies to latest
back-compat tag, so you need to run "ant download-tag" before applying
it. Comments/questions:
* Init'd doc = -1 in BooleanScorer
* Can you add an "assert scorer.docID() == -1" in IndexSearcher
right when it gets the scorer? Then we can tease out where we
failed to init to -1.
* Hmm... maybe we permit DISI.docID() to also return NO_MORE_DOCS
after the DISI is created? EG we do this in ConjunctionScorer.
(Or, maybe, any docID that's < the first real docID...hmmm.)
* Made DocsWriter.applyDeletes a bit more efficient -- no need to
check for the sentinel (it's "congruent" w/ the existing check).
Though it did require an upcast to long, so if we do any add
arithmetic w/ doc where doc could be NO_MORE_DOCS we must be
careful to upcast.
* I think we can remove the firstTime from ReqExclScorer, since
docID() is defined to return -1 at start?
* Made BS.coordFactors final
* Fixed "Shai Erera vs. Mike McCandless" -> "Shai Erera
via Mike McCandless"
* The addition of this:
{code}
if (docNr == -1) { // should be if nextDoc() was not called yet
docNr = nextDoc();
}
{code}
in BooleanScorer2.score(Collector, int) makes me a bit nervous --
I think one is supposed to have called nextDoc prior to calling
this? Also, this was added to the same method in Scorer.
* BS2.nextDoc is still needing to check if it's supposed to call
initCountingSumScorer? Can we do this in ctor?
* Actually, you did get rid of firstTime from ConjunctionScorer?
Maybe you meant BS2? (Oh, or maybe you meant the addition of
"} else if (lastDoc == -1) {" in ConjunctionScorer? So... if we
had a way to do that sorting (in the ctor) without invoking
nextDoc on each sub-scorer, then you could eliminate that extra
check right?
* Put some "nocommit" questions in the patch
> 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
>
>
> 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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