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From "Martijn van Groningen (Commented) (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3496) Support grouping by IndexDocValues
Date Fri, 07 Oct 2011 16:39:29 GMT


Martijn van Groningen commented on LUCENE-3496:

Up until now I only checked the difference between BYTES_VAR_SORTED and BYTES_FIXED_SORTED.
The search time and memory usage seem to be more or less the same. I executed all queries
on 30M index and the performance with grouping by IDV is somewhere between 500 ms and 550
ms. The same test with grouping by indexed values have search times somewhere between 300
ms and 330 ms.

bq. We might need to round up the packedint sizes inside IDV for lookup perf and pay the prize
for a slightly larger size on disk / memory.
I think we need this. Just like we have with FC#getTermsIndex(). A boolean option that either
uses PackedInt or DirectInt. I think the ~200 ms difference is b/c IDV is using PackedInt
and FC uses DirectInt.

> Support grouping by IndexDocValues
> ----------------------------------
>                 Key: LUCENE-3496
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: modules/grouping
>            Reporter: Martijn van Groningen
>         Attachments: LUCENE-3496.patch
> Although IDV is not yet finalized (More particular the SortedSource). I think we already
can discuss / investigate implementing grouping by IDV.

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