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https://issues.apache.org/jira/browse/SOLR-9193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-9193:
---------------------------------
Attachment: SOLR-9193.patch
First patch with the scoreNodes expression working. A simple testcase is
included.
This builds on the work to the TermsComponent in SOLR-9243.
> Add scoreNodes Streaming Expression
> -----------------------------------
>
> Key: SOLR-9193
> URL: https://issues.apache.org/jira/browse/SOLR-9193
> Project: Solr
> Issue Type: New Feature
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Fix For: 6.2
>
> Attachments: SOLR-9193.patch
>
>
> The scoreNodes Streaming Expression is another *GraphExpression*. It will
> decorate a gatherNodes expression and us a tf-idf scoring algorithm to score
> the nodes.
> The gatherNodes expression only gathers nodes and aggregations. This is
> similar in nature to tf in search ranking, where the number of times a node
> appears in the traversal represents the tf. But this skews recommendations
> towards nodes that appear frequently in the index.
> Using the idf for each node we can score each node as a function of tf and
> idf. This will provide a boost to nodes that appear less frequently in the
> index.
> The scoreNodes expression will gather the idf's from the shards for each node
> emitted by the underlying gatherNodes expression. It will then assign the
> score to each node.
> The computed score will be added to each node in the *nodeScore* field. The
> docFreq of the node across the entire collection will be added to each node
> in the *nodeFreq* field. Other streaming expressions can then perform a
> ranking based on the nodeScore or compute their own score using the nodeFreq.
> proposed syntax:
> {code}
> top(n="10",
> sort="nodeScore desc",
> scoreNodes(gatherNodes(...)))
> {code}
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