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From frank shi <finalxc...@gmail.com>
Subject solr sort groups by the sum of the scores of the documents within each group
Date Mon, 05 May 2014 03:16:10 GMT
Currently, solr grouping (http://wiki.apache.org/solr/FieldCollapsing) sorts
groups "by the score of the top document within each group". E.g.
[...]
"groups":[{
    "groupValue":"81cb63020d0339adb019a924b2a9e0c2",
    "doclist":{"numFound":9,"start":0,"maxScore":4.729042,"docs":[
        {
          "id":"7481df771afe39fab368ce19dfeeb528",
          [...],
          "score":4.729042},
        {
          "id":"c879e95b5f16343dad8b1248133727c2",
          [...],
          "score":4.6635237},
        {
          "id":"485b9aec90fd3ef381f013c51ab6a4df",
          [...],
          "score":4.347174}]
    }},
[...]
Is there an out-of-the-box way to sort groups by the sum of the scores of
the documents within each group? E.g.
[...]
"groups":[{
    "groupValue":"81cb63020d0339adb019a924b2a9e0c2",
    "doclist":{"numFound":9,"start":0,"scoreSum":13.739738,"docs":[
        {
          "id":"7481df771afe39fab368ce19dfeeb528",
          [...],
          "score":4.729042},
        {
          "id":"c879e95b5f16343dad8b1248133727c2",
          [...],
          "score":4.6635237},
        {
          "id":"485b9aec90fd3ef381f013c51ab6a4df",
          [...],
          "score":4.347174}]
    }},
[...]
With the release of sorting by Function Query
(https://issues.apache.org/jira/browse/SOLR-1297), it seems that there
should be a way to use the sum() function
(http://wiki.apache.org/solr/FunctionQuery). But it's not quite close enough
since the "score" field is not part of the documents.

I feel like I'm close but I'm missing some obvious piece. I'm using Solr
4.6.



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