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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2013/02/11 21:05:13 UTC
[jira] [Updated] (LUCENE-4771) Query-time join collectors could
maybe be more efficient
[ https://issues.apache.org/jira/browse/LUCENE-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir updated LUCENE-4771:
--------------------------------
Attachment: LUCENE-4771_prototype.patch
here's a prototype... it seems to mostly work but there is a bug eventually in the random test :)
its against branches/lucene4765 because thats just what i was working with.
> Query-time join collectors could maybe be more efficient
> --------------------------------------------------------
>
> Key: LUCENE-4771
> URL: https://issues.apache.org/jira/browse/LUCENE-4771
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/join
> Reporter: Robert Muir
> Attachments: LUCENE-4771_prototype.patch
>
>
> I was looking @ these collectors on LUCENE-4765 and I noticed:
> * SingleValued collector (SV) pulls FieldCache.getTerms and adds the bytes to a bytesrefhash per-collect.
> * MultiValued collector (MV) pulls FieldCache.getDocTermsOrds, but doesnt use the ords, just looks up each value and adds the bytes per-collect.
> I think instead its worth investigating if SV should use getTermsIndex, and both collectors just collect-up their per-segment ords in something like a BitSet[maxOrd].
> When asked for the terms at the end in getCollectorTerms(), they could merge these into one BytesRefHash.
> Of course, if you are going to turn around and execute the query against the same searcher anyway (is this the typical case?), this could even be more efficient: No need to hash or instantiate all the terms in memory, we could do postpone the lookups to SeekingTermSetTermsEnum.accept()/nextSeekTerm() i think... somehow :)
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