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https://issues.apache.org/jira/browse/SOLR-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774053#action_12774053
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Otis Gospodnetic commented on SOLR-1537:
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The "ID" here being the uniqueKey? i.e. the use case is the removal of dupes
when the same document is indexed in multiple shards and more than 1 shard
return that document in the result set?
> Dedupe Sharded Search Results by Shard Order or Score
> -----------------------------------------------------
>
> Key: SOLR-1537
> URL: https://issues.apache.org/jira/browse/SOLR-1537
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 1.4, 1.5
> Environment: All
> Reporter: Dennis Kubes
> Fix For: 1.5
>
> Attachments: solr-dedupe-20091031-2.patch, solr-dedupe-20091031.patch
>
>
> Allows sharded search results to dedupe results by ID based on either the
> order of the shards in the shards param or by score. Allows the result
> returned to be deterministic. If by shards then shards that appear first in
> the shards param have a higher precedence than shards that appear later. If
> by score then higher scores beat out lower scores. This doesn't allow
> multiple duplicates because currently SOLR only permits a single result by ID
> to be returned.
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