[jira] [Commented] (LUCENE-4771) Query-time join collectors could maybe be more efficient

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576092#comment-13576092 ] 

Robert Muir commented on LUCENE-4771:
-------------------------------------

for this to be fast the BitsFilteredTermsEnum would have to seek to nextSetBit or whatever... I think thats easy to fix.

Another thing i dont like is that then the Query returned by JoinUtil then depends on the old reader.

But i think it demonstrates the idea... a faster collect() and not having to hash and load up all the term bytes in RAM.
                
> 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, LUCENE-4771_prototype_without_bug.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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