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From Peter Karich <>
Subject Re: Alternative for field collapsing
Date Tue, 22 Jun 2010 09:31:15 GMT
Hi Raakhi,

yes, then the collapse patch works perfectly in our case. If you don't
get the patch applied correctly, try asking directly here:

I did the same and got immediately response from Martin & Co or try the
latest patch:
2010-06-17 03:08 PM Martijn van Groningen

Querying is simple:

and you will get back only one document for the same title containing
'peter' and
additionally the 'similar'/collapse-count for every document:
<lst name="collapse_counts">
  <str name="field">title</str>
  <lst name="results">
    <int name="collapseCount">4512</int>
    <int name="collapseCount">4010</int>


> Hi,
>         I wanted to apply field collapsing on the title(type string). but
> want to show only one document (and the count of such documents) per title
> rather than show all the documents.
> Regards
> Raakhi
> On Tue, Jun 22, 2010 at 12:59 AM, Peter Karich <> wrote:
>> Hi Raakhi,
>> First, field collapsing works pretty well in our system. And, as Martin
>> has said on 17.06.2010 in the other thread "Field Collapsing SOLR-236":
>> I've added a new patch to the issue, so building the trunk (rev
>> 955615) with the latest patch should not be a problem. Due to recent
>> changes in the Lucene trunk the patch was not compatible.
>> Second, if the id is unique applying field collapse make no sense. So I
>> suppose you will apply field collapsing to the title, right?
>> But in this case, why doesn't a simple query ala q=title:'my
>> title'&sort=price asc work for you? Or what do you want to achieve?
>> (The title should be of type string, I think)
>> Regards,
>> Peter.
>>> Hi,
>>>       I have an index with the following fields:
>>>       id  (unique)
>>>       title
>>>       description
>>>       price.
>>> Suppose i want to find unique documents and count of all documents with
>> the
>>> same title, sorted on price.
>>> How do i go about it.
>>> Knowing that field collapsing is not stable with 1.4.
>>> if i go about using facet's on id, it sorts either on id or on the count,
>>> but not on the price,
>>> Any Suggestions??
>>> Regards,
>>> Raakhi


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