Fix VectorScorer#bulk eagerly advancing its iterator - #16377
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tteofili merged 1 commit intoJul 20, 2026
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The default bulk() implementation advanced its iterator as a side
effect of construction, unlike Bulk.fromRandomScorerDense/Sparse,
which defer positioning to the first nextDocsAndScores call. Move
the positioning into the returned Bulk to match, and update the
javadoc.
The current behavior is problematic when combining the iterator
with others via conjunction. Given that this API is evolving
and the behavior is split I propose adopting the lazy behavior.
In one case, I hit the following error:
Caused by: java.lang.IllegalArgumentException: Sub-iterators of ConjunctionDISI are not on the same document!
at ConjunctionDISI.throwSubIteratorsNotOnSameDocument(ConjunctionDISI.java:149)
at ConjunctionDISI.createConjunction(ConjunctionDISI.java:104)
at ConjunctionUtils.intersectScorers(ConjunctionUtils.java:44)
at ConjunctionScorer.<init>(ConjunctionScorer.java:36)
at BooleanScorerSupplier.requiredBulkScorer(BooleanScorerSupplier.java:453)
at BooleanScorerSupplier.booleanScorer(BooleanScorerSupplier.java:219)
at BooleanScorerSupplier.bulkScorer(BooleanScorerSupplier.java:177)
The tests don't hit this error because it's trivial to confirm
that the bulk call is side effect free.
michaeljmarshall
added a commit
to carlosdelest/elasticsearch
that referenced
this pull request
Jul 8, 2026
Build the bulk scorer lazily; building it eagerly broke conjunctions with sibling filter clauses. Test added in this commit failed without the change. See apache/lucene#16377.
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Description
The default bulk() implementation advanced its iterator as a side effect of construction, unlike Bulk.fromRandomScorerDense/Sparse, which defer positioning to the first nextDocsAndScores call. Move the positioning into the returned Bulk to match, and update the javadoc.
The current behavior is problematic when combining the iterator with others via conjunction. Given that this API is evolving and the behavior is split I propose adopting the lazy behavior.
In one case, I hit the following error:
The tests confirm the bulk call is side effect free, which will satisfy the
ConjunctionDISIrequirements.