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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