[Xapian-discuss] Making SORTAFTER useful in omega?

[Arjen van der Meijden]

Alec,

I don't really understand your answer or perhaps you didn't understand 
my question.
I want relevance sort. But when two results are more or less similar in 
terms of relevance, I want the newest first (which can indeed be 
supplied with a value).

This is actually what the SORTAFTER in omega is for. But the chance of 
two results having the same relevance is almost zero, so in practice it 
doesn't work.

Best regards,

Arjen

On 11-9-2008 17:39 alexander lind wrote:
> Can't you just use the reordering parameter 'SORT' to sort on a value 
> number?  In this a value number where you'd have put the dates that your 
> users wants to sort by?
> 
> Alec
> 
> On Sep 11, 2008, at 7:12 AM, Arjen van der Meijden wrote:
> 
>> Is there no one with some input on this issue?
>>
>> Best regards,
>>
>> Arjen
>>
>> On 1-9-2008 22:43 Arjen van der Meijden wrote:
>>> Hello List,
>>>
>>> Our users keep asking for some more "logical" sorting of search results.
>>> Now the results are sorted on relevance, i.e. the raw weight, by
>>> default. But since the users only see the percentage, that results in a
>>> seemingly random secondary sorting.
>>>
>>> According to the docs and earlier mails, omega has the 'SORTAFTER' (and
>>> docid sorting) functionality to allow date-based secondary sorting. But
>>> according to later mails and the documentation that's only useful if you
>>> don't use the default BM25-weighting. Unfortunately you can't alter the
>>> weighting scheme via Omega-calls.
>>> Nor does it seem to help to simply patch query.cc to use TradWeight
>>> rather than BM25.
>>>
>>> Since we've built our set-up around omega, we'd rather not have to build
>>> something similar or patch omega just because its missing a small but
>>> important feature. Is it somehow possible to make the newer results in
>>> the seemingly similarly relevant results sort on top within Omega?
>>>
>>> Best regards,
>>>
>>> Arjen
>>>
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>>>
>>
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> 
>