Ryan:
bq: I don't want it to issue phrase queries to that field ever
This is one of those requirements that you'd have to enforce at the
app layer. Having Solr (or Lucene) enforce a rule like this for
everyone would be terrible.
So if you're turning off TF but also saying title is "one of the
primary components of score". Since TF in integral to calculating
scores, I'm not quite sure what that means.
You could write a custom similarity class that returns whatever you
want (1.0 comes to mind) from the tf() method.
Best,
Erick
On Wed, Apr 8, 2015 at 4:50 PM, Ryan Josal <rjo...@gmail.com> wrote:
> Thanks for your thought Shawn, I don't think fq will be helpful here. The
> field for which I want to turn TF off is "title", which is actually one of
> the primary components of score, so I really need it in qf. I just don't
> want the TF portion of the score for that field only. I don't want it to
> issue phrase queries to that field ever, but if the user quotes something,
> it does, and I don't know how to make it stop. To me it seems potentially
> more appropriate to send that to the pf fields, although I can think of a
> couple good reasons to put it against qf. That's fine as long as it
> doesn't try to build a phrase query against a no TF no pos field.
>
> Ryan
>
> On Wednesday, April 8, 2015, Shawn Heisey <apa...@elyograg.org> wrote:
>
>> On 4/8/2015 5:06 PM, Ryan Josal wrote:
>> > The error:
>> > IllegalStateException: field "foo" indexed without position data; cannot
>> > run PhraseQuery.
>> >
>> > It would actually be ok for us to index position data but there isn't an
>> > option for that without term frequencies. No TF is important for us when
>> > it comes to searching product titles.
>> >
>> > I should say that only a small fraction of user queries contained quoted
>> > phrases that trigger this error, so it works much of the time, but we'd
>> > also like to continue supporting user quoted phrase queries.
>> >
>> > So how can I index a field without TF and use it in edismax qf?
>>
>> If you omit positions, you can't do phrase queries. As far as I know,
>> there is no option in Solr to omit only frequencies and not positions.
>>
>> I think there is a way that you can achieve what you want, though. What
>> you are looking for is filters. The fq parameter (filter query) will
>> restrict the result set to only entries that match the query, but will
>> not affect the relevancy score *at all*. Here is an example of a filter
>> query that restricts the results to items that are in stock, assuming
>> you have the appropriate schema:
>>
>> fq=inStock:true
>>
>> Queries specified in fq will default to the lucene query parser, but you
>> can override that if you need to. This query would be equivalent to the
>> previous one, but it would be parsed using edismax:
>>
>> fq={!edismax}inStock:true
>>
>> Here's another example of a useful filter, using yet another query parser:
>>
>> fq={!terms f=userId}bob,alice,susan
>>
>> Remember, the reason I have suggested filters is that they do not
>> influence score.
>>
>>
>> https://cwiki.apache.org/confluence/display/solr/Common+Query+Parameters#CommonQueryParameters-Thefq%28FilterQuery%29Parameter
>>
>> Thanks,
>> Shawn
>>
>>
