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https://issues.apache.org/jira/browse/LUCENE-9541?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayya Sharipova updated LUCENE-9541:
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Description:
Not completely sure if this is a bug.
BitSetConjuctionDISI advances based on its lead – DocIdSetIterator iterator,
and doesn't consider that its another component – BitSetIterator may have
already advanced passed a certain doc. This may result in duplicate documents.
For example if BitSetConjuctionDISI _disi_ is composed of DocIdSetIterator _a_
of docs [0,1] and BitSetIterator _b_ of docs [0,1]. Doing `b.nextDoc()` we
are collecting doc0, doing `disi.nextDoc` we again collecting the same doc0.
It seems that other conjunction iterators don't have this behaviour, if we are
advancing any of their component pass a certain document, the whole conjunction
iterator will also be advanced pass this document.
This behaviour was exposed in this
[PR|https://github.com/apache/lucene-solr/pull/1903].
was:
Not completely sure if this is a bug.
BitSetConjuctionDISI advances based on its lead – DocIdSetIterator iterator,
and doesn't consider that its another component – BitSetIterator may have
already advanced passed a certain doc. This may result in duplicate documents.
This behaviour was exposed in this
[PR|https://github.com/apache/lucene-solr/pull/1903].
> BitSetConjunctionDISI can advance to docs before its components
> ---------------------------------------------------------------
>
> Key: LUCENE-9541
> URL: https://issues.apache.org/jira/browse/LUCENE-9541
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Mayya Sharipova
> Priority: Minor
>
> Not completely sure if this is a bug.
> BitSetConjuctionDISI advances based on its lead – DocIdSetIterator iterator,
> and doesn't consider that its another component – BitSetIterator may have
> already advanced passed a certain doc. This may result in duplicate documents.
> For example if BitSetConjuctionDISI _disi_ is composed of DocIdSetIterator
> _a_ of docs [0,1] and BitSetIterator _b_ of docs [0,1]. Doing `b.nextDoc()`
> we are collecting doc0, doing `disi.nextDoc` we again collecting the same
> doc0.
> It seems that other conjunction iterators don't have this behaviour, if we
> are advancing any of their component pass a certain document, the whole
> conjunction iterator will also be advanced pass this document.
>
> This behaviour was exposed in this
> [PR|https://github.com/apache/lucene-solr/pull/1903].
>
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