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Posted to java-user@lucene.apache.org by Rupinder Singh Mazara <rs...@ebi.ac.uk> on 2004/10/18 20:39:42 UTC
QueryParsing
hi all
i have a question regarding the QueryParser and Proximity Searches
I executed the following piece of code
String x = "\"jakarta apache\"~100";
QueryParser parser = new QueryParser("FULL_TEXT",new
StandardAnalyzer() );
parser.setOperator( QueryParser.DEFAULT_OPERATOR_AND );
Query query = parser.parse(x);
System.out.println(query.getClass()+" - "+query.toString());
IndexReader indexReader = IndexReader.open( new File(luceneroot) );
query = query.rewrite(indexReader);
System.out.println(query.getClass()+" - "+query.toString());
in both System.out.println I get the following result
class org.apache.lucene.search.PhraseQuery - FULL_TEXT:"jakarta apache"~100
is this correct, I was expecting to see a SpanQuery being formed at the
second println statement
I have take this from the example in
http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
If I remove the quotes I see a QueryParsing error which tell me that the
Similarity should be between 0.0 and 1.0
which is as expected
please let me know if I missed something
Regards
Rupinder
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RE: QueryParsing
Posted by Rupinder Singh Mazara <rs...@ebi.ac.uk>.
thank you Morus
this makes things very clear to me
Regards
Rupinder
>-----Original Message-----
>From: Morus Walter [mailto:morus.walter@tanto.de]
>Sent: 19 October 2004 10:05
>To: Lucene Users List
>Subject: RE: QueryParsing
>
>
>Rupinder Singh Mazara writes:
>> hi erik and everyone else
>>
>> ok i will buy the book ;)
>> but this still does not solve the problem of
>> why String x = "\"jakarta apache\"~100"; is being transalted as a
>> PhraseQuery
>> FULL_TEXT:"jakarta apache"~100
>>
>> is the correct query beining formed ? or is there something
>wrong with the
>> Proximity Search topic in the URL
>> http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
>>
>A proximity search is done by a PhraseQuery with a slop.
>The slop makes the PhraseQuery to perform a proximity search (so you can
>argue that the name is problematic).
>That's what query parser creates.
>
>SpanQueries where introduced later. Maybe you can get the effect of a
>proximity search by SpanQueries also, but that's not handled by the query
>parser.
>
>Morus
>
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RE: QueryParsing
Posted by Morus Walter <mo...@tanto.de>.
Rupinder Singh Mazara writes:
> hi erik and everyone else
>
> ok i will buy the book ;)
> but this still does not solve the problem of
> why String x = "\"jakarta apache\"~100"; is being transalted as a
> PhraseQuery
> FULL_TEXT:"jakarta apache"~100
>
> is the correct query beining formed ? or is there something wrong with the
> Proximity Search topic in the URL
> http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
>
A proximity search is done by a PhraseQuery with a slop.
The slop makes the PhraseQuery to perform a proximity search (so you can
argue that the name is problematic).
That's what query parser creates.
SpanQueries where introduced later. Maybe you can get the effect of a
proximity search by SpanQueries also, but that's not handled by the query
parser.
Morus
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RE: QueryParsing
Posted by Rupinder Singh Mazara <rs...@ebi.ac.uk>.
hi erik and everyone else
ok i will buy the book ;)
but this still does not solve the problem of
why String x = "\"jakarta apache\"~100"; is being transalted as a
PhraseQuery
FULL_TEXT:"jakarta apache"~100
is the correct query beining formed ? or is there something wrong with the
Proximity Search topic in the URL
http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
Regards
Rupinder
>-----Original Message-----
>From: Erik Hatcher [mailto:erik@ehatchersolutions.com]
>Sent: 18 October 2004 21:05
>To: Lucene Users List
>Subject: Re: QueryParsing
>
>
>QueryParser does not (currently) support SpanQuery's. PhraseQuery is
>what you'll always get with double-quoted strings. However, you can
>customize the behavior and get a SpanQuery instead by subclassing and
>overriding getPhraseQuery. In fact, this is an example I wrote for
>Lucene in Action.
>
> Erik
>
>
>On Oct 18, 2004, at 2:39 PM, Rupinder Singh Mazara wrote:
>
>> hi all
>>
>> i have a question regarding the QueryParser and Proximity Searches
>> I executed the following piece of code
>>
>> String x = "\"jakarta apache\"~100";
>> QueryParser parser = new QueryParser("FULL_TEXT",new
>> StandardAnalyzer() );
>> parser.setOperator( QueryParser.DEFAULT_OPERATOR_AND );
>> Query query = parser.parse(x);
>> System.out.println(query.getClass()+" - "+query.toString());
>>
>> IndexReader indexReader = IndexReader.open( new File(luceneroot)
>> );
>>
>> query = query.rewrite(indexReader);
>> System.out.println(query.getClass()+" - "+query.toString());
>>
>> in both System.out.println I get the following result
>> class org.apache.lucene.search.PhraseQuery - FULL_TEXT:"jakarta
>> apache"~100
>>
>> is this correct, I was expecting to see a SpanQuery being formed at
>> the
>> second println statement
>>
>>
>> I have take this from the example in
>> http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
>>
>> If I remove the quotes I see a QueryParsing error which tell me that
>> the
>> Similarity should be between 0.0 and 1.0
>> which is as expected
>>
>> please let me know if I missed something
>>
>>
>> Regards
>>
>>
>> Rupinder
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: lucene-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: lucene-user-help@jakarta.apache.org
>
>
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>
>
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Re: QueryParsing
Posted by Erik Hatcher <er...@ehatchersolutions.com>.
QueryParser does not (currently) support SpanQuery's. PhraseQuery is
what you'll always get with double-quoted strings. However, you can
customize the behavior and get a SpanQuery instead by subclassing and
overriding getPhraseQuery. In fact, this is an example I wrote for
Lucene in Action.
Erik
On Oct 18, 2004, at 2:39 PM, Rupinder Singh Mazara wrote:
> hi all
>
> i have a question regarding the QueryParser and Proximity Searches
> I executed the following piece of code
>
> String x = "\"jakarta apache\"~100";
> QueryParser parser = new QueryParser("FULL_TEXT",new
> StandardAnalyzer() );
> parser.setOperator( QueryParser.DEFAULT_OPERATOR_AND );
> Query query = parser.parse(x);
> System.out.println(query.getClass()+" - "+query.toString());
>
> IndexReader indexReader = IndexReader.open( new File(luceneroot)
> );
>
> query = query.rewrite(indexReader);
> System.out.println(query.getClass()+" - "+query.toString());
>
> in both System.out.println I get the following result
> class org.apache.lucene.search.PhraseQuery - FULL_TEXT:"jakarta
> apache"~100
>
> is this correct, I was expecting to see a SpanQuery being formed at
> the
> second println statement
>
>
> I have take this from the example in
> http://jakarta.apache.org/lucene/docs/queryparsersyntax.html
>
> If I remove the quotes I see a QueryParsing error which tell me that
> the
> Similarity should be between 0.0 and 1.0
> which is as expected
>
> please let me know if I missed something
>
>
> Regards
>
>
> Rupinder
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: lucene-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: lucene-user-help@jakarta.apache.org
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