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https://issues.apache.org/jira/browse/LUCENE-6926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6926:
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Attachment: LUCENE-6926.patch
Here is a patch which changes several things:
- ReqExclScorer now always exposes a two phase iterator, using the
approximation of the positive clause as an approximation. This is useful
because advancing to a non-excluded doc can be heavy if the excluded clause
matches lots of documents. It also makes Lucene check deleted docs before we
check the excluded clause.
- In case ReqExclScorer needs to confirm both two phase iterators, it will
confirm the least-costly one first.
- The matchCost() now includes the match cost of the excluded clause and
tries to take into account the cost of advance (by using an arbitrary constant,
but this is probably better than nothing?)
> Take matchCost into account for MUST_NOT clauses
> ------------------------------------------------
>
> Key: LUCENE-6926
> URL: https://issues.apache.org/jira/browse/LUCENE-6926
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6926.patch
>
>
> ReqExclScorer potentially has two TwoPhaseIterators to check: the one for the
> positive clause and the one for the negative clause. It should leverage the
> match cost API to check the least costly one first.
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