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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
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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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