[jira] Commented: (SOLR-236) Field collapsing

["Marc Menghin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789381#action_12789381 ] 

Marc Menghin commented on SOLR-236:
-----------------------------------

Hi,

new to Solr, so sorry for my likely still incomplete setup. I got everything from Solr SVN and applied the Patch (field-collapse-5.patch	2009-12-08 09:43 PM). As I search I get a NPE because I seem to not have a cache for the collapsing. It wants to add a entry to the cache but can't. There is none at that time, which it checks before in AbstractDocumentCollapser.collapse but still wants to use it later in AbstractDocumentCollapser.createDocumentCollapseResult. I suppose thats a bug? Or is something wrong on my side?

Exception I get is:

java.lang.NullPointerException
	at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.createDocumentCollapseResult(AbstractDocumentCollapser.java:278)
	at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.executeCollapse(AbstractDocumentCollapser.java:249)
	at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.collapse(AbstractDocumentCollapser.java:172)
	at org.apache.solr.handler.component.CollapseComponent.doProcess(CollapseComponent.java:173)
	at org.apache.solr.handler.component.CollapseComponent.process(CollapseComponent.java:127)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:195)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1316)

I fixed it locally by only adding something to the cache if there is one (fieldCollapseCache != null). But I'm not very into the code so not sure if thats a good/right way to fix it.

Thanks,
Marc

> 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
>             Fix For: 1.5
>
>         Attachments: collapsing-patch-to-1.3.0-dieter.patch, collapsing-patch-to-1.3.0-ivan.patch, collapsing-patch-to-1.3.0-ivan_2.patch, collapsing-patch-to-1.3.0-ivan_3.patch, field-collapse-3.patch, field-collapse-4-with-solrj.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-solr-236-2.patch, field-collapse-solr-236.patch, 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, quasidistributed.additional.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, solr-236.patch, SOLR-236_collapsing.patch, SOLR-236_collapsing.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 ;-)

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