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From Michael McCandless <>
Subject Re: Boolean Query: Knowing Which Clauses Matched
Date Wed, 18 Jul 2012 13:25:08 GMT
This is possible, using the ScorerVisitor (3.6) / getChildren (4.0).
You need a custom collector that when it collects a competitive hit,
visits the sub-scorers of your BooleanQuery and saves away which ones
matched the current doc.

But this is very expert and there are real challenges (eg not all
scorers score document-at-a-time) ... would be nice if someone wrote
up some example code showing how to do it...

Mike McCandless

On Wed, Jul 18, 2012 at 7:17 AM, Ashish Jaen <> wrote:
> Is there a way to know which sub-clause of a boolean query matched in the
> result document ? Currently I am using searcher.explain() on each of the
> sub-clause of the boolean query (on each of the documents returned by
> searcher). However, this is turning out to be very slow as I need to
> process ALL the documents returned by the query (A typical query returns
> about 20 thousand documents and my collection has 10 million docs. My
> application is not a user facing one, so few seconds per query is still
> acceptable)
> I was wondering if there is a efficient way to achieve the above which
> doesnot use explain() (perhaps storing the information about which
> sub-clause matched a document while searching). Can anyone provide some
> method to solve this and point to the relevant classes which need to be
> changed.
> Thanks,
> -Ashish

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