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Posted to java-user@lucene.apache.org by Charlie <ch...@gmail.com> on 2006/07/24 17:48:29 UTC
Re[2]: Span Query NLE
Thanks for both of you, Karl and Chris.
You both made my intention even more clearer.
So now the question is:
Is there a powerful QueryParser.jj can process span query syntax?
(prerequisite is: have we ever defined the Span Query Syntax?)
I will be boasting if I am claim to write one now. I had only one
compiler class and never feel good about it:)
--
Best regards,
Charlie
---
Monday, July 24, 2006, 2:04:35 AM, you wrote:
: >> Would anyone give me a hint regarding the natural language expression
: >> of the following span query?
> : I'm sorry, but all queries are not supported by the QueryParser. Spans
> : beeing one of them. See QueryParser.jj to add your syntax.
> I think one of us is missunderstanding the question ... in my mind the
> "natural language expression" for this query...
> spanNear([spanOr([spanNear([field:six, field:hundred], 0, true),
> spanNear([field:seven, field:hundred], 0, true)
> ]),
> spanOr([field:seven, field:six])],
> 100, true)
> ...is...
> Either "six" followed by "hundred" with no gap between them, or "seven"
> followed by "hundred" with no gap between them; followed by either
> "seven" or "six" with a gap of no more no more then 100 tokens in
> between them.
> It's a fairly contrived test case from TestSpansAdvanced if i'm not
> mistaken, constructed purely to test some complex combinations.
> An example that might make a little more sense is something like...
> spanNear([spanOr([spanNear([field:Erik, field:Hatcher], 0, true),
> spanNear([field:Otis, field:Gospodnetic], 0, true)
> ]),
> spanOr([field:Apache, field:Lucene])],
> 100, false)
> ...which I would translate as...
> Either "Erik" followed by "Hatcher" with no gap between them, or "Otis"
> followed by "Gospodnetic" with no gap between them; near either
> "Apache" or "Lucene" with a gap of no more no more then 100 tokens in
> between them.
> -Hoss
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Re: Span Query NLE
Posted by Paul Elschot <pa...@xs4all.nl>.
On Tuesday 25 July 2006 03:26, Charlie wrote:
...
>
> can "surround" be nested
>
> 3w(4n(a?a AND bb?) AND cc+)
Yes, but iirc the "arguments" need to be separated by comma's:
3w( 4n( ... , ...) , ...)
instead of by AND.
Regards,
Paul Elschot
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Re: Re[2]: Span Query NLE
Posted by karl wettin <ka...@gmail.com>.
On Mon, 2006-07-24 at 13:44 -0400, Erik Hatcher wrote:
> It does take some time for someone unfamiliar with JavaCC, such as
> myself initially, to implement a custom parser but it can be a huge
> success for a project to have this capability.
5 cents:
In case of anyone consider writing a new query parser that can be
contributed to Apache, I would recommend using ANTlr instead, as the
grammar can be compiled to most languages with a Lucene-port.
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Re[4]: Span Query NLE
Posted by Charlie <ch...@gmail.com>.
Thanks Erik,
"surround" query parser is surely interesting to me.
I really wish surround.txt could explain more in detail and add more
examples, especially in its test cases, it will be very instrumental
to add similar test cases like what
org.apache.lucene.queryParser.TestQueryParser offered and show
assertQueryEquals().
Anyways, so what's the proper interpretation of the following:
3w(a?a or bb?, cc+)
can "surround" be nested
3w(4n(a?a AND bb?) AND cc+)
And have you seen/written examples to actually use "surround" query
parser? (not the proprietary one you have mentioned.) I am currently
looking at the package, not much doc to read though.
--
Best regards,
Charlie
---
Monday, July 24, 2006, 12:44:16 PM, you wrote:
> The "surround" query parser in Lucene's contrib area implements a
> language to construct SpanQuery's. Check out surround.txt in
> Subversion:
>
> <http://svn.apache.org/repos/asf/lucene/java/trunk/contrib/surround/>
> I have written a query parser for a client that allows construction
> of very sophisticated queries including the full spectrum of
> SpanQuery's, but the language is legacy and not something I'd wish
> upon the general public, and the code is proprietary anyway. It does
> take some time for someone unfamiliar with JavaCC, such as myself
> initially, to implement a custom parser but it can be a huge success
> for a project to have this capability.
> Erik
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Re: Re[2]: Span Query NLE
Posted by Erik Hatcher <er...@ehatchersolutions.com>.
The "surround" query parser in Lucene's contrib area implements a
language to construct SpanQuery's. Check out surround.txt in
Subversion:
<http://svn.apache.org/repos/asf/lucene/java/trunk/contrib/surround/>
I have written a query parser for a client that allows construction
of very sophisticated queries including the full spectrum of
SpanQuery's, but the language is legacy and not something I'd wish
upon the general public, and the code is proprietary anyway. It does
take some time for someone unfamiliar with JavaCC, such as myself
initially, to implement a custom parser but it can be a huge success
for a project to have this capability.
Erik
On Jul 24, 2006, at 11:48 AM, Charlie wrote:
> Thanks for both of you, Karl and Chris.
>
> You both made my intention even more clearer.
>
> So now the question is:
>
> Is there a powerful QueryParser.jj can process span query syntax?
>
> (prerequisite is: have we ever defined the Span Query Syntax?)
>
> I will be boasting if I am claim to write one now. I had only one
> compiler class and never feel good about it:)
>
> --
> Best regards,
> Charlie
>
>
> ---
> Monday, July 24, 2006, 2:04:35 AM, you wrote:
>
>
> : >> Would anyone give me a hint regarding the natural language
> expression
> : >> of the following span query?
>
>> : I'm sorry, but all queries are not supported by the QueryParser.
>> Spans
>> : beeing one of them. See QueryParser.jj to add your syntax.
>
>> I think one of us is missunderstanding the question ... in my mind
>> the
>> "natural language expression" for this query...
>
>> spanNear([spanOr([spanNear([field:six, field:hundred], 0, true),
>> spanNear([field:seven, field:hundred], 0, true)
>> ]),
>> spanOr([field:seven, field:six])],
>> 100, true)
>
>> ...is...
>
>> Either "six" followed by "hundred" with no gap between them, or
>> "seven"
>> followed by "hundred" with no gap between them; followed by either
>> "seven" or "six" with a gap of no more no more then 100 tokens in
>> between them.
>
>> It's a fairly contrived test case from TestSpansAdvanced if i'm not
>> mistaken, constructed purely to test some complex combinations.
>
>> An example that might make a little more sense is something like...
>
>> spanNear([spanOr([spanNear([field:Erik, field:Hatcher], 0, true),
>> spanNear([field:Otis, field:Gospodnetic], 0,
>> true)
>> ]),
>> spanOr([field:Apache, field:Lucene])],
>> 100, false)
>
>> ...which I would translate as...
>
>> Either "Erik" followed by "Hatcher" with no gap between them, or
>> "Otis"
>> followed by "Gospodnetic" with no gap between them; near either
>> "Apache" or "Lucene" with a gap of no more no more then 100
>> tokens in
>> between them.
>
>
>> -Hoss
>
>
>
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