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Posted to issues@lucene.apache.org by "Alan Woodward (Jira)" <ji...@apache.org> on 2019/10/14 11:08:00 UTC
[jira] [Created] (LUCENE-9005) BooleanQuery.visit() incorrectly
pulls subvisitors from its parent
Alan Woodward created LUCENE-9005:
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Summary: BooleanQuery.visit() incorrectly pulls subvisitors from its parent
Key: LUCENE-9005
URL: https://issues.apache.org/jira/browse/LUCENE-9005
Project: Lucene - Core
Issue Type: Bug
Reporter: Alan Woodward
Assignee: Alan Woodward
BooleanQuery.visit() calls getSubVisitor once for each of its clause sets; however, this sub visitor is called on the passed-in visitor, which means that sub clauses get attached to its parent, rather than a visitor for that particular BQ.
To illustrate, consider the following nested BooleanQuery: ("a b" (+c +d %e f)); we have a top-level disjunction query containing one phrase query (essentially a conjunction), and one boolean query containing both MUST, FILTER and SHOULD clauses. When visiting, the top level query will pull a SHOULD subvisitor, and pass both queries into it. The phrase query will pull a MUST subvisitor and all its two terms. The nested boolean will pull a MUST, and FILTER and a SHOULD; but these are all attached to the parent SHOULD visitor - in particular, the MUST and FILTER clauses will end up being attached to this SHOULD visitor, and be mis-interpreted as a disjunction.
To fix this, BQ should first pull a MUST visitor and visit its MUST clauses using this visitor; SHOULD, FILTER and MUST_NOT clauses should then be pulled from this top-level MUST visitor.
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