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Doug Steigerwald commented on SOLR-236: --------------------------------------- I'm in the process of updating our Solr build and I'm running into issues with this patch now. I added the code in the first issue Matthias mentioned. Unfortunately whenever I try to do any field collapsing, I get a NPE: java.lang.NullPointerException at org.apache.solr.search.CollapseFilter.getCollapseInfo(CollapseFilter.java:263) at org.apache.solr.handler.component.CollapseComponent.process(CollapseComponent.java:65) ... My request handler for testing is simple. It only has the collapse component in it. Posting the example docs and trying to execute the following query gives me the NPE. http://localhost:8983/solr/search?q=*:*&collapse.field=cat&collapse.type=normal Updated my trunk this morning (r687489). > Field collapsing > ---------------- > > Key: SOLR-236 > URL: https://issues.apache.org/jira/browse/SOLR-236 > Project: Solr > Issue Type: New Feature > Components: search > Affects Versions: 1.3 > Reporter: Emmanuel Keller > Assignee: Otis Gospodnetic > Fix For: 1.4 > > Attachments: field-collapsing-extended-592129.patch, > field_collapsing_1.1.0.patch, field_collapsing_1.3.patch, > field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff, > field_collapsing_dsteigerwald.diff, SOLR-236-FieldCollapsing.patch, > SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, solr-236.patch > > > This patch include a new feature called "Field collapsing". > "Used in order to collapse a group of results with similar value for a given > field to a single entry in the result set. Site collapsing is a special case > of this, where all results for a given web site is collapsed into one or two > entries in the result set, typically with an associated "more documents from > this site" link. See also Duplicate detection." > http://www.fastsearch.com/glossary.aspx?m=48&amid=299 > The implementation add 3 new query parameters (SolrParams): > "collapse.field" to choose the field used to group results > "collapse.type" normal (default value) or adjacent > "collapse.max" to select how many continuous results are allowed before > collapsing > TODO (in progress): > - More documentation (on source code) > - Test cases > Two patches: > - "field_collapsing.patch" for current development version > - "field_collapsing_1.1.0.patch" for Solr-1.1.0 > P.S.: Feedback and misspelling correction are welcome ;-) -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.