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From "Massimo Schiavon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-2650) Empty docs array on response with grouping and result pagination
Date Wed, 13 Jul 2011 10:17:59 GMT
Empty docs array on response with grouping and result pagination
----------------------------------------------------------------

                 Key: SOLR-2650
                 URL: https://issues.apache.org/jira/browse/SOLR-2650
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 3.3
            Reporter: Massimo Schiavon


Requesting a certain number of rows and setting start parameter to a greater value returns
0 results with grouping enabled.

For example, requesting:
http://localhost:8080/solr/web/select/?q=*:*&rows=1&start=2

(grouping and highlighting are enabled by default)

I get this response:
[...]
      response: {
          numFound: 117852
          start: 2
          docs: [ ]
      }
      highlighting: {
            0938630598: {
                  title: [ "..." ]
                  content: [ "..." ]
            }
      }
[...]
docs array is empty while the highlighted values of the document are present

Debugging the request in
org.apache.solr.search.Grouping.Command.createSimpleResponse() at row 534
[...]
     int len = Math.min(numGroups, docsGathered);
      if (offset > len) {
        len = 0;
      }
[...]
The initial vars values are:
numGroups = 1
docsGathered = 3
offset = 2
so after the execution len = 0

I've tried commenting the if statement and this resolves the issue but could introduce some
other bugs.

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