CLOUDP-415919 - Backports WANDScorer and leading wildcard query fixes to 10.4.0 - #20
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Lucene apache#13408 (released in 10.0) dropped a guard in BooleanScorerSupplier.optionalBulkScorer that previously kept TOP_SCORES + minShouldMatch > 1 queries on WANDScorer. As a side effect, when matches are dense, dispatch now lands on BooleanScorer, which has no top-K impact pruning — causing 10–100× latency regressions on pure-should compound queries with minimumShouldMatch > 1.
MultiTermQuery constant-score wrapper now defers term collection to ScorerSupplier#get() for queries with an unknown term count (automaton queries such as wildcard/regexp/prefix/range), instead of scanning the term dictionary while building the ScorerSupplier. This keeps the ScorerSupplier "planning" phase cheap so a parent conjunction can short-circuit (e.g. a sibling clause matching no documents) before a non-seekable scan, such as a leading wildcard, runs. If the term dictionary is large and a leading wildcard query matches very few times (<16 (BOOLEAN_REWRITE_TERM_COUNT_THRESHOLD)), using lazy instead of eager evaluation could save a lot of unnecessary term collection.
txwei
changed the title
txwei
marked this pull request as ready for review
June 22, 2026 20:09
mccullocht
approved these changes
Jun 22, 2026
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Description
This PR backports commits 01a6272 and 8c5a4be