Adrien Grand created LUCENE-9103:
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Summary: WANDScorer can miss some hits
Key: LUCENE-9103
URL: https://issues.apache.org/jira/browse/LUCENE-9103
Project: Lucene - Core
Issue Type: Bug
Reporter: Adrien Grand
Fix For: 8.4
I found the issue while building the release candidate for 8.4. There is a rare
bug in WANDScorer that occurs when a block is ignored because the sum of the
maximum scores is less than the minimum competitive score. In that case
WANDScorer advances until it finds a block where the sum of the maximum scores
is greater than the minimum competitive score. Then it pops clauses from the
tail until the maximum score of the tail gets smaller than the minimum
competitive score, advances these clauses beyond the current target, and treats
the smallest doc ID as the next candidate. This is where the bug lies:
sometimes this candidate will be beyond the current block and WANDScorer won't
update maximum scores of other clauses. In this case it might skip over hits
thinking that they can't have a competitive score when in fact they could.
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