Thank you, Timothy.
I have support for and am using SpanNotQuery elsewhere. Maybe there is
another use for it that I'm not considering. I'm wondering if there's a
clever way of reusing it in order to satisfy the requirements of proximity
NOTs, too.
dtSearch allows a user to have NOTs embedded in proximity searches.
I.e.
Let's say you have an index whose ID has been converted to English phrases,
like 1001 would be "One thousand one"
"one thousand one hundred" pre/0 (thirty and not (six or seven))
Returns: 1130, 1131, 1132, 1133, 1134, 1135, 1138, 1139
Perhaps I've been staring at the screen too long and the obvious answer is
hiding from me.
Here's how I'm trying to implement it, but it's incorrect... It's giving
me 1130..1139 without excluding anything.
public Query visitNot_expr(Not_exprContext ctx) {
//ProximityNotSupportedFor("NOT");
Query subquery = visit(ctx.expr());
BooleanQuery.Builder query = new BooleanQuery.Builder();
query.add(subquery, BooleanClause.Occur.MUST_NOT);
// TODO: Consolidate this so that we don't use MatchAllDocsQuery, but using
the other query, to increase performance
query.add(new MatchAllDocsQuery(), BooleanClause.Occur.SHOULD);
if(currentlyInASpanQuery){
SpanQuery matchAllDocs = getSpanWildcardQuery(new
Term(defaultFieldName,"*"));
SpanNotQuery snq = new SpanNotQuery(matchAllDocs, (SpanQuery)subquery,
Integer.MAX_VALUE, Integer.MAX_VALUE);
return snq;
} else {
return query.build();
}
}
protected SpanQuery getSpanWildcardQuery(Term term) {
WildcardQuery wq = new WildcardQuery(term);
SpanQuery swq = new SpanMultiTermQueryWrapper<>(wq);
return swq;
}
On Mon, Jun 20, 2016 at 2:53 PM, Allison, Timothy B. <talli...@mitre.org>
wrote:
> Bouncing over to user’s list.
>
>
>
> As you’ve found, spans are different from regular queries. MUST_NOT at
> the BooleanQuery level means that the term must not appear anywhere in the
> document; whereas spans focus on terms near each other.
>
>
>
> Have you tried SpanNotQuery? This would allow you at least to do
> something like:
>
>
>
> termA but not if zyx or yyy appears X words before or Y words after
>
>
>
>
>
>
>
> *From:* Brandon Miller [mailto:computerengineer.bran...@gmail.com]
> *Sent:* Monday, June 20, 2016 2:36 PM
> *To:* d...@lucene.apache.org
> *Subject:* SpanQuery - How to wrap a NOT subquery
>
>
>
> Greetings!
>
>
>
> I'm wanting to support this:
>
> TermA within_N_terms_of (abc and cba or xyz and not zyx or not yyy)
>
>
>
> Focusing on the sub-query:
>
> I have ANDs and ORs figured out (special tricks playing with slops and
> such).
>
>
>
> I'm having the hardest time figuring out how to wrap a NOT.
>
>
>
> Outside of SpanQuery, I'm using a BooleanQuery with a MUST_NOT clause.
> That's fine (if you know another way, I'd like to hear that, too, but this
> appears to work dandy).
>
>
>
> However, SpanQuery requires queries that are also of type SpanQuery or
> SpanMultiTermQueryWrapper will allow you to throw in anything derived from
> MultiTermQuery (which includes AutomatedQuery).
>
>
>
> Right now, I'm at a loss. We have huge, complex, nested boolean queries
> inside proximity operators with our current solution.
>
>
>
> If I need to write a custom solution, then that's what I need to hear and
> perhaps a couple of pointers.
>
>
>
> Thanks a bunch and God bless!
>
>
>
> Brandon
>
