SpanNearQuery does more work than PhraseQuery - it keeps track of all matching
spans, whereas PhraseQuery does not. Whether the performance difference will
be relevant depends on your environment and data - so it may not be a big deal
at all.
Erik
On Sep 21, 2011, at 10:44 , Em wrote:
> Hi Erik,
>
> could you explain why PhraseQuery performs better than SpanNearQuery?
>
> Some time has passed since I read about it, however I think it was
> exactly the other way round.
>
> Thanks!
>
> Em
>
> Am 21.09.2011 15:56, schrieb Erik Hatcher:
>> PhraseQuery suffices for the stated requirement of boosting when query terms
>> are closer. A common technique is to incorporate a PhraseQuery with a large
>> slop factor of the query terms into the query automatically, which
>> implicitly boosts matching documents when the query terms are closer. A
>> SpanNearQuery would work too, but a PhraseQuery might be easier to
>> incorporate and will be faster performing.
>>
>> Erik
>>
>> On Sep 21, 2011, at 05:31 , Akos Tajti wrote:
>>
>>> Thanks, I will check SpanNearQuery!
>>>
>>> Regards,
>>> Ákos
>>>
>>>
>>>
>>>
>>> On Wed, Sep 21, 2011 at 2:20 PM, Em <[email protected]> wrote:
>>>
>>>> Àkos,
>>>>
>>>> have a look at SpanNearQuery. This is what you want.
>>>> If you own the 2nd Edition of Lucene in Action have a look at their
>>>> examples. It illustrates how to combine them with the classical queries.
>>>>
>>>> Regards,
>>>> Em
>>>>
>>>> Am 21.09.2011 13:46, schrieb Akos Tajti:
>>>>> Dear List,
>>>>>
>>>>> for multi term expressions I'd like to add higher rank if the matches are
>>>>> closer to each other. For example for the search term "like eating" the
>>>>> string "i like eating" comes before "I like some eating".
>>>>>
>>>>> Is this possible?
>>>>>
>>>>> Thanks in advance,
>>>>>
>>>>> Ákos Tajti
>>>>>
>>>>
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