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From Dave Kor <s0454...@sms.ed.ac.uk>
Subject Re: Unexpected: ordered
Date Sun, 03 Jul 2005 15:42:28 GMT
Quoting Paul Elschot <paul.elschot@xs4all.nl>:

> On Sunday 03 July 2005 15:27, Dave Kor wrote:
> > I have a system that automatically generate span queries to Lucene.
> Sometimes,
> > the system generates a query like this one which always throws a
> > RuntimeException:
> >
> > spanNear([spanNear([text:interesting], 3, true),
> spanNear([text:interesting,
> > text:john, text:said], 8, true)], 2, true)
> >
> > Basically, the system is looking for a document that contains a string
> sequence
> > "interesting .... interesting john said". The thrown exception is as
> follows:
> >
> > java.lang.RuntimeException: Unexpected: ordered
> >         at
> >
>
org.apache.lucene.search.spans.NearSpans.firstNonOrderedNextToPartialList(Unknown
> > Source)
> >         at org.apache.lucene.search.spans.NearSpans.next(Unknown Source)
> >         at org.apache.lucene.search.spans.SpanScorer.next(Unknown Source)
> >         at org.apache.lucene.search.Scorer.score(Unknown Source)
> >         at org.apache.lucene.search.IndexSearcher.search(Unknown Source)
> >
> > My question is, what does is this "Unexpected: ordered" mean? and is there
> > anyway I can avoid these exceptions?
>
> It's an internal error that is not supposed to occur.
> Could you continue on the java-dev list?
>
> SpanNearQuery is not supposed to operate on a single argument, at least
> that's what I thought when I wrote the bug fix code that throws this
> exception. Does the exception go away when you replace the first spanNear
> (the one with the single [text:interesting]  with a SpanTermQuery ?
>
> It's also possible that the code cannot handle the two identical
> text:interesting arguments.
>
> It's probably good to have a test case for this. Could you extend the
> exception with the document number and maybe a position within the
> document to try and get to the original text that causes this exception,
> and use that to file a bug report?

I'll see what I can do about the test case. From what I can tell thus far, this
exception is thrown when CellQueue is empty in the function
NearSpan.firstNonOrderedNextToPartialList(). I hope it rings a bell somewhere.


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