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From John Seer <pulsph...@yahoo.com>
Subject Re: Sequential match query
Date Mon, 13 Apr 2009 18:18:39 GMT

If I understand you guys correct
If I have term which has n tokens I will need to create n SpanTermQuery put
them in array and pass it to SpanNearQuery?



Erik Hatcher wrote:
> 
> 
> On Apr 12, 2009, at 8:15 AM, Tim Williams wrote:
> 
>> On Sun, Apr 12, 2009 at 5:56 AM, Erik Hatcher
>> <erik@ehatchersolutions.com> wrote:
>>>
>>> On Apr 11, 2009, at 9:11 PM, Tim Williams wrote:
>>>
>>>> On Sat, Apr 11, 2009 at 12:25 PM, Erick Erickson
>>>> <erickerickson@gmail.com> wrote:
>>>>>
>>>>> That'll teach me to scan a post. The link I sent you
>>>>> is still relevant, but wildcards are NOT intended to be used to
>>>>> concatenate terms. You want a phrase query or a span query
>>>>> for that. i.e. "A C F"~# where # is the "slop", that is, the number
>>>>> of other terms allowed to appear between your desired terms.
>>>>>
>>>>> SpanQueries are constructed programmatically, and PhraseQueries
>>>>> are produced by the parser.
>>>>
>>>> As I understand it though, there's no way to use the queryparser to
>>>> construct an *ordered* phrase query with slop (which is what I think
>>>> he's after), right?  I gather that'd have to be done manually with a
>>>> SpanNearQuery.  I'd love to hear that the query parser has syntax  
>>>> for
>>>> this though...
>>>
>>> QueryParser does not create any SpanQuery's, but one can subclass
>>> QueryParser and override getFieldQuery() to put in a SpanQuery  
>>> instead of a
>>> PhraseQuery.
>>
>> Thanks Erik, wouldn't this be an all-or-nothing replacement though?
>> In other words, by creating ordered SpanNearQuery's as the override,
>> wouldn't he loose the current unordered PhraseQuery+slop
>> functionality?  I haven't seen a way to subclass the QueryParser to
>> support both (e.g. extend the syntax)?
> 
> As always, it depends.  If the QueryParser subclass has a switch to  
> toggle between SpanNearQuery and PhraseQuery it could controlled by  
> the code which way to go.  But yeah, it's not currently possible to  
> extend the syntax of QueryParser with a subclass.  There is a nice new  
> open issue with a new query parser implementation that is vastly more  
> flexible - we'll see that come in to Lucene in the near future.
> 
> 	Erik
> 
> 
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