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Posted to java-user@lucene.apache.org by stephane vaucher <va...@LUB.UMontreal.CA> on 2002/11/19 20:50:08 UTC
QueryParser
Hello lucene gurus,
I've been experimenting with the QueryParser supplied with lucene and
have a question. I've read from the FAQ that the grammar is the following:
Query ::= Clause ( [ Conjunction ] Clause ) *
Conjunction ::= 'AND' | 'OR' | '||'
Clause ::= [ Modifier ] [ FieldName ':' ] BasicClause [ Boost ]
Modifier ::= '-' | '+' | '!' | 'NOT'
BasicClause ::= ( Term | Phrase | | PrefixQuery '(' Query ')'
PrefixQuery ::= Term '*'
Phrase ::= '"' Term * '"'
Boost ::= '^' DecimalDigit+ '.' DecimalDigit+
Term ::= <a-word-or-token-to-match>
FieldName ::= <name-of-an-indexed-field>
From what I've gathered was that we can have a request like the following:
a) (snow AND removal) OR foo
b) (snow AND removal)^2 OR foo
However, when I print the result(query) of the parsing, I have the
following results:
a) (+snow +remov al) foo --> OK
b) +snow +removal --> ??? I lose the foo and there is no boost
I haven't seen any posts about this case, so I don't know if I'm doing
something wrong or simply weird enough that it hasn't been tested ( I
haven't seen any tests in
org.apache.lucene.queryParser.TestQueryParser.java)...
My environment:
I'm using Lucene-1.2 production release
on:
Linux RH 7.0
with:
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
Thanks,
Stephane Vaucher
Software designer
CIRANO
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Re: QueryParser
Posted by stephane vaucher <va...@LUB.UMontreal.CA>.
Hi Otis,
I've tested the following. I don't know if I'm hitting expected
behaviour, but it seems suspicious:
258,262d257
<
< public void testPhraseBoost() throws Exception{
< assertQueryEquals("(a AND b) OR c", null, "(+a +b) c");
< assertQueryEquals("(a AND b)^2 c", null, "(+a +b)^2.0 c");
< }
--> junit result
There was 1 failure:
1)
testPhraseBoost(org.apache.lucene.queryParser.TestQueryParser)junit.framework.AssertionFailedError:
Query /(a AND b)^2 c/ yielded /+a +b/, expecting /(+a +b)^2.0 c/
at
org.apache.lucene.queryParser.TestQueryParser.assertQueryEquals(Unknown
Source)
at
org.apache.lucene.queryParser.TestQueryParser.testPhraseBoost(Unknown
Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Stephane
Otis Gospodnetic wrote:
>Maybe it would be good if you could send some unit test code this way
>so that we can properly populate
>org.apache.lucene.queryParser.TestQueryParser.java with tests that will
>reveal bugs, such as the potential bug that you are reporting.
>
>Thanks,
>Otis
>
>
>
>--- stephane vaucher <va...@LUB.UMontreal.CA> wrote:
>
>>Hello lucene gurus,
>>
>>I've been experimenting with the QueryParser supplied with lucene and
>>
>>have a question. I've read from the FAQ that the grammar is the
>>following:
>>
>>Query ::= Clause ( [ Conjunction ] Clause ) *
>>Conjunction ::= 'AND' | 'OR' | '||'
>>Clause ::= [ Modifier ] [ FieldName ':' ] BasicClause [ Boost ]
>>Modifier ::= '-' | '+' | '!' | 'NOT'
>>BasicClause ::= ( Term | Phrase | | PrefixQuery '(' Query ')'
>>PrefixQuery ::= Term '*'
>>Phrase ::= '"' Term * '"'
>>Boost ::= '^' DecimalDigit+ '.' DecimalDigit+
>>Term ::= <a-word-or-token-to-match>
>>FieldName ::= <name-of-an-indexed-field>
>>
>> From what I've gathered was that we can have a request like the
>>following:
>>a) (snow AND removal) OR foo
>>b) (snow AND removal)^2 OR foo
>>
>>However, when I print the result(query) of the parsing, I have the
>>following results:
>>a) (+snow +remov al) foo --> OK
>>b) +snow +removal --> ??? I lose the foo and there is no boost
>>
>>I haven't seen any posts about this case, so I don't know if I'm
>>doing
>>something wrong or simply weird enough that it hasn't been tested ( I
>>
>>haven't seen any tests in
>>org.apache.lucene.queryParser.TestQueryParser.java)...
>>
>>My environment:
>>
>>I'm using Lucene-1.2 production release
>>on:
>>Linux RH 7.0
>>with:
>>java version "1.4.1"
>>Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
>>Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
>>
>>Thanks,
>>Stephane Vaucher
>>Software designer
>>CIRANO
>>
>>
>>
>>
>>--
>>To unsubscribe, e-mail:
>><ma...@jakarta.apache.org>
>>For additional commands, e-mail:
>><ma...@jakarta.apache.org>
>>
>
>
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>For additional commands, e-mail: <ma...@jakarta.apache.org>
>
>
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For additional commands, e-mail: <ma...@jakarta.apache.org>
Re: QueryParser
Posted by Otis Gospodnetic <ot...@yahoo.com>.
Maybe it would be good if you could send some unit test code this way
so that we can properly populate
org.apache.lucene.queryParser.TestQueryParser.java with tests that will
reveal bugs, such as the potential bug that you are reporting.
Thanks,
Otis
--- stephane vaucher <va...@LUB.UMontreal.CA> wrote:
> Hello lucene gurus,
>
> I've been experimenting with the QueryParser supplied with lucene and
>
> have a question. I've read from the FAQ that the grammar is the
> following:
>
> Query ::= Clause ( [ Conjunction ] Clause ) *
> Conjunction ::= 'AND' | 'OR' | '||'
> Clause ::= [ Modifier ] [ FieldName ':' ] BasicClause [ Boost ]
> Modifier ::= '-' | '+' | '!' | 'NOT'
> BasicClause ::= ( Term | Phrase | | PrefixQuery '(' Query ')'
> PrefixQuery ::= Term '*'
> Phrase ::= '"' Term * '"'
> Boost ::= '^' DecimalDigit+ '.' DecimalDigit+
> Term ::= <a-word-or-token-to-match>
> FieldName ::= <name-of-an-indexed-field>
>
> From what I've gathered was that we can have a request like the
> following:
> a) (snow AND removal) OR foo
> b) (snow AND removal)^2 OR foo
>
> However, when I print the result(query) of the parsing, I have the
> following results:
> a) (+snow +remov al) foo --> OK
> b) +snow +removal --> ??? I lose the foo and there is no boost
>
> I haven't seen any posts about this case, so I don't know if I'm
> doing
> something wrong or simply weird enough that it hasn't been tested ( I
>
> haven't seen any tests in
> org.apache.lucene.queryParser.TestQueryParser.java)...
>
> My environment:
>
> I'm using Lucene-1.2 production release
> on:
> Linux RH 7.0
> with:
> java version "1.4.1"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
> Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
>
> Thanks,
> Stephane Vaucher
> Software designer
> CIRANO
>
>
>
>
> --
> To unsubscribe, e-mail:
> <ma...@jakarta.apache.org>
> For additional commands, e-mail:
> <ma...@jakarta.apache.org>
>
__________________________________________________
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Yahoo! Web Hosting - Let the expert host your site
http://webhosting.yahoo.com
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