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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-6645) BKD tree queries should use BitDocIdSet.Builder
Date Tue, 30 Jun 2015 17:33:04 GMT
Michael McCandless created LUCENE-6645:
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             Summary: BKD tree queries should use BitDocIdSet.Builder
                 Key: LUCENE-6645
                 URL: https://issues.apache.org/jira/browse/LUCENE-6645
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless


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
queries.

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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