Full Text Search Fuzzy Operator

[Matías Parodi]

Hello,

The documentation says that Stardog supports the full-text-search operator ~ with weights like in foo~0.8.

I have "induct" in the database, and I'm trying to query using "induccion~0.4", which gives 0 results.

If I didn't get it wrong, "induccion~0.4" should match anything len(induccion)*(1-0.4)=5.4 distance away. So why is it not returning "induct" (I tried with all ways in 0-1 actually)?

Am I doing something wrong or is it a bug?

Thanks,

Matt

[Matías Parodi]

I clearly meant "weights", not "ways" :)

[Mike Grove]

Hard do say without seeing a complete working example that demonstrates the behavior.  The full-text searches are a hybrid between what lucene supports and the query engine, so Lucene could be coming up with that result, but it doesn't join w/ the rest of the query and is filtered out.

Cheers,

Mike

 

Thanks,

Matt

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[Matías Parodi]

I see what you mean, here is an example:

SELECT ?text
WHERE {
  GRAPH ?g {
    ?text <http://jena.hpl.hp.com/ARQ/property#textMatch> ( "induct" 0.0 ).
  }
}

Returns "induct".

SELECT *
WHERE {
  GRAPH ?g {
    ?text <http://jena.hpl.hp.com/ARQ/property#textMatch> ( "induccion~0.4" 0.0 ).
  }
}

Returns nothing.

The distance between "induct" and "induccion" is 4 or 5 (depending on the cost of replacing a char). Which is less than length(induccion)*(1-0.4)=5.4

Cheers,

Matt

[Mike Grove]

Can you provide the data?

Cheers,

Mike

[Matías Parodi]

Here is an example:

---

@prefix : <http://example.com/#>.

:keyword

    rdf:type owl:DatatypeProperty;

    rdfs:range xsd:string

.

# To try querying "induccion~0.4"
:Foo :keyword "induct".

# To try querying "computer~0.4"

:Bar :keyword "computer".

:Yada :keyword "computers".

---

Matt

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[Mike Grove]

I think this is working as expected, I verified that we're not pruning anything we shouldnt, and that Lucene is returning a FuzzyQuery.

When I search for 'computer~0.4', i get both :Bar and :Yada.  I don't get results for 'induccion~0.4' and I think that's because it's too far away.  'inducci~0.4' returns resutls, so the fuzzy matching is working.

Cheers,

Mike