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Posted to dev@lucene.apache.org by "Martijn Laarman (JIRA)" <ji...@apache.org> on 2011/06/29 16:56:29 UTC

[jira] [Created] (LUCENE-3257) Nested Field Collapsing

Nested Field Collapsing
-----------------------

                 Key: LUCENE-3257
                 URL: https://issues.apache.org/jira/browse/LUCENE-3257
             Project: Lucene - Java
          Issue Type: New Feature
          Components: modules/grouping
            Reporter: Martijn Laarman


Currently specifying grouping on multiple fields returns multiple datasets.

It would be nice if Solr supported cascading / nested grouping by applying the first group over the entire result set, the next over each group and so forth and so forth.

Even if limited to supporting nesting grouping 2 levels deep would cover alot of use cases.

group.field=location&group.field=type

-Location X
---Type 1
-----documents
---Type 2
----documents
-Location Y
---Type 1
----documents
---Type 2
----documents

instead of 
-Location X
- documents
-Location Y
--documents

-Type 1
--documents
-Type2
--documents

See also https://issues.apache.org/jira/browse/SOLR-2553

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