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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (LUCENE-6645) BKD tree queries should use BitDocIdSet.Builder
Date Thu, 09 Jul 2015 21:21:05 GMT


ASF subversion and git services commented on LUCENE-6645:

Commit 1690175 from [~mikemccand] in branch 'dev/trunk'
[ ]

LUCENE-6645: optimize DocIdSetBuilder a bit more

> BKD tree queries should use BitDocIdSet.Builder
> -----------------------------------------------
>                 Key: LUCENE-6645
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>         Attachments: LUCENE-6645.patch, LUCENE-6645.patch, LUCENE-6645.patch, LUCENE-6645.patch,
LUCENE-6645.patch, LUCENE-6645.patch
> When I was iterating on BKD tree originally I remember trying to use this builder (which
makes a sparse bit set at first and then upgrades to dense if enough bits get set) and being
disappointed with its performance.
> I wound up just making a FixedBitSet every time, but this is obviously wasteful for small
> It could be the perf was poor because I was always .or'ing in DISIs that had 512 - 1024
hits each time (the size of each leaf cell in the BKD tree)?  I also had to make my own DISI
wrapper around each leaf cell... maybe that was the source of the slowness, not sure.
> I also sort of wondered whether the SmallDocSet in spatial module (backed by a SentinelIntSet)
might be faster ... though it'd need to be sorted in the and after building before returning
to Lucene.

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