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https://issues.apache.org/jira/browse/SOLR-8888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15216094#comment-15216094
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Joel Bernstein commented on SOLR-8888:
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Ok, I do see how the columns are "=" during join, so it does makes sense. I'll
change the syntax.
> 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
>
>
> This ticket is to implement a distributed shortest path graph traversal as a
> Streaming Expression.
> Expression syntax:
> {code}
> shortestPath(collection,
> from="node1",
> to="node2",
> edge="colA, colB",
> threads="6",
> partitionSize="300",
> fq="limiting query",
> maxDepth="4")
> {code}
> Th expression above performs a *breadth first search* to find the shortest
> path in an unweighted, directed graph. The search is performed *from* node1
> *to* node2, traversing the *edge* columns colA to colB iteratively. Each
> level in the traversal is implemented as a *parallel partitioned* nested loop
> join. 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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