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https://issues.apache.org/jira/browse/SOLR-8888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220942#comment-15220942
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ASF subversion and git services commented on SOLR-8888:
-------------------------------------------------------
Commit f8ae0d0deb0f2a8c035c89dbf118646531f60f71 in lucene-solr's branch
refs/heads/master from jbernste
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=f8ae0d0 ]
SOLR-8888: Update CHANGES.txt
> Add shortestPath Streaming Expression
> -------------------------------------
>
> Key: SOLR-8888
> URL: https://issues.apache.org/jira/browse/SOLR-8888
> Project: Solr
> Issue Type: Improvement
> Reporter: Joel Bernstein
> Attachments: SOLR-8888.patch, SOLR-8888.patch, SOLR-8888.patch,
> SOLR-8888.patch, SOLR-8888.patch, SOLR-8888.patch, SOLR-8888.patch,
> SOLR-8888.patch, SOLR-8888.patch
>
>
> This ticket is to implement a distributed shortest path graph traversal as a
> Streaming Expression.
> Expression syntax:
> {code}
> shortestPath(collection,
> from="[email protected]",
> to="[email protected]",
> edge="from=to",
> threads="6",
> partitionSize="300",
> fq="limiting query",
> maxDepth="4")
> {code}
> The expression above performs a *breadth first search* to find the shortest
> paths in an unweighted, directed graph. The search starts from the node
> [email protected] and searches for the node [email protected], traversing the
> *edges* by iteratively joining the *from* and *to* columns. Each level in the
> traversal is implemented as a *parallel partitioned* nested loop join across
> the entire *collection*. The *threads* parameter controls the number of
> threads performing the join at each level. The *partitionSize* controls the
> of number of nodes in each join partition. *maxDepth* controls the number of
> levels to traverse. *fq* is a limiting query applied to each level in the
> traversal.
> Future implementations can add more capabilities such as weighted traversals.
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