Hi David,
On 4/22/2009 at 4:15 PM, David Seltzer wrote:
> I have some code that dynamically creates a Boolean query designed to
> work as a filter. After the query runs I end up with this filter.
>
> Filter: QueryWrapperFilter(+(-SourceID:100)
> +spanNear([ArticleContent:nuclear, ArticleContent:proliferation], 30,
> false))
>
> My expectation is that this should limit the resultset to only results
> that matches 'nuclear' NEAR 'proliferation' and are not tagged with
> SourceID 100. Can anyone think of a reason that this would exclude all
> content?
>
> There are plenty of legitimate hits.
>
> Is the +(-SourceID:100) a problem?
Prohibited clauses need a non-prohibited sibling clause in order to function.
+(-SourceID:100) means:
/+/ : only match docs from:
/-SourceID:100/ : do not match docs with SourceID:100, from:
//: (the empty set)
That last line is the key here: you're excluding docs from a set that was empty
to begin with.
You can remedy this either by removing the required clause around the
prohibited clause, i.e.:
Filter: QueryWrapperFilter(-SourceID:100
+spanNear([ArticleContent:nuclear,
ArticleContent:proliferation],
30, false))
or by adding a MatchAllDocsQuery to the required clause containing the
prohibited clause:
Filter: QueryWrapperFilter(+(-SourceID:100 *:*)
+spanNear([ArticleContent:nuclear,
ArticleContent:proliferation],
30, false))
Steve
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