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Date: Mon, 11 Feb 2013 16:37:14 +0000 (UTC)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12631745.1360600593484.273437.1360600634359@arcas>
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Subject: [jira] [Created] (LUCENE-4771) Query-time join collectors could
 maybe be more efficient
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Robert Muir created LUCENE-4771:
-----------------------------------

             Summary: 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


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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