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  1. Lucene - Core
  2. LUCENE-9005

BooleanQuery.visit() incorrectly pulls subvisitors from its parent


    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 9.0, 8.3
    • None
    • None
    • New


      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.


        1. LUCENE-9005.patch
          2 kB
          Alan Woodward



            romseygeek Alan Woodward
            romseygeek Alan Woodward
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