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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638359#action_12638359
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Mark Miller commented on SOLR-236:
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bq. What's a hard drive sort?
Sorry - was not very clear.
Just like sorting, finding dupes can be done in memory or using external
storage (harddrive). I am only just looking into this stuff myself, but it
seems in the best case you would want to do it in memory with a hash system
which can be linear scalability. If you have too many items to look for dupes
in, you have to use external storage - one good method is two external sorts
(we get one from the search), but there are other options too I think.
> 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 ;-)
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