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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