lucene index

[Tze-John Tang]

Is there any way for me to hit the lucene index directly, i.e. can I point Luke at the Waldo directory and test queries that way? I have never used Luke before, but I am getting a 'No valid directory at the location, try another location' error.

-tj

[Mike Grove]

I don't know anything about Luke, but you can just use the Search API [1] in Stardog to query the search index directly without going through SPARQL.

Cheers,

Mike

[1] http://docs.stardog.com/java/snarl/com/complexible/stardog/api/search/SearchConnection.html

On Wed, May 14, 2014 at 9:32 AM, Tze-John Tang <tzejoh...@gmail.com> wrote:

Is there any way for me to hit the lucene index directly, i.e. can I point Luke at the Waldo directory and test queries that way? I have never used Luke before, but I am getting a 'No valid directory at the location, try another location' error.

-tj

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[Tze-John Tang]

Luke is suposed to be able to be pointed directly at a Lucene index.

https://code.google.com/p/luke/

Are the contents of the Waldo directory a Lucene index? The reason why I am looking at using Luke is that it is supposed to make it easier for me to figure out why certain matches are not happening. For example right now, I am trying to match on phone numbers ending with a specific suffuix.

(?text ?score) <http://jena.hpl.hp.com/ARQ/property#textMatch> ('*5-3134' .5)

Currently in the SPARQL Query window, this does not return. When I try the same a similar query from the command line, I get the error:

Cannot parse '*5-3134': '*' or '?' not allowed as first character in WildcardQuery

That might be why the SPARQL query is not returning? When I try other search terms, which worked from SPARQL, I get "No results found for query." i.e. 

stardog query search -q "tj tang" -l 10 infrastructureDb

Would this possibly be because the data is in a named graph. The following is the query that works in SPARQL.

(?text ?score) <http://jena.hpl.hp.com/ARQ/property#textMatch> ('TJ Tang' .5) .

-tj

[Mike Grove]

On Wed, May 14, 2014 at 12:30 PM, Tze-John Tang <tzejoh...@gmail.com> wrote:

Luke is suposed to be able to be pointed directly at a Lucene index.

https://code.google.com/p/luke/

Are the contents of the Waldo directory a Lucene index? The reason why I am looking at using Luke is that it is supposed to make it easier for me to figure out why certain matches are not happening. For example right now, I am trying to match on phone numbers ending with a specific suffuix.

(?text ?score) <http://jena.hpl.hp.com/ARQ/property#textMatch> ('*5-3134' .5)

Currently in the SPARQL Query window, this does not return. When I try the same a similar query from the command line, I get the error:

Cannot parse '*5-3134': '*' or '?' not allowed as first character in WildcardQuery

Searches with a leading wildcard are disabled in Lucene by default [1], you can enable them in Stardog with the stardog.properties 'leading.wildcard.search.enabled' option. 

 

That might be why the SPARQL query is not returning? When I try other search terms, which worked from SPARQL, I get "No results found for query." i.e. 

stardog query search -q "tj tang" -l 10 infrastructureDb

Would this possibly be because the data is in a named graph. The following is the query that works in SPARQL.

Yes, 'query search' and Searcher assuming you're only searching over the default graph.

Cheers,

Mike

[Mike Grove]

I forgot the reference:

[1] http://wiki.apache.org/lucene-java/LuceneFAQ#What_wildcard_search_support_is_available_from_Lucene.3F

[Tze-John Tang]

On an added note. Luke does work when pointed to the Waldo directory, I just needed to pull Luke from a different location [1]. The current google code location is no longer being updated and only supports lucene 3.5.

[1] https://java.net/projects/opengrok/downloads?search_tag=luke&commit=search