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From: Paul Elschot <paul.elschot@xs4all.nl>
To: java-user@lucene.apache.org
Subject: Re: BufferedIndexInput.readByte performance; Spans not unique
Date: Sat, 27 May 2006 15:02:11 +0200
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On Saturday 27 May 2006 13:39, Michael Chan wrote:
> > A few things might help:
> > - use getSpans() on the scorer of the query, iterate the resulting Spans
> >   and count the number of different doc values.
> >   This saves the scoring and the sorting on score value.
> 
> Thanks for your advice. I was wondering, is each span given by
> getSpans() a unique match according to the given query?

Not always: it is possible for different terms to be indexed in the
same position, and it is also possible to create a SpanOrQuery
in which the same Span(Term)Query occurs more than once.
The spans will be ordered, so in case they are not unique, the
ones with the same begin/end positions in the same doc will
be consecutive.

Regards,
Paul Elschot

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