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https://issues.apache.org/jira/browse/SOLR-8888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276343#comment-15276343
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Joel Bernstein commented on SOLR-8888:
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Thanks for the patcht! Let's create new for ticket for this though, something
like "refactor shortestPath streaming expression".
> Add shortestPath Streaming Expression
> -------------------------------------
>
> Key: SOLR-8888
> URL: https://issues.apache.org/jira/browse/SOLR-8888
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 6.1
> Reporter: Joel Bernstein
> Fix For: 6.1
>
> Attachments: SOLR-8888.1.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, 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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