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Posted to dev@lucene.apache.org by "Anshum Gupta (JIRA)" <ji...@apache.org> on 2016/04/27 20:43:13 UTC
[jira] [Updated] (SOLR-7543) Create GraphQuery that allows graph
traversal as a query operator.
[ https://issues.apache.org/jira/browse/SOLR-7543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Anshum Gupta updated SOLR-7543:
-------------------------------
Fix Version/s: (was: master)
6.0
> Create GraphQuery that allows graph traversal as a query operator.
> ------------------------------------------------------------------
>
> Key: SOLR-7543
> URL: https://issues.apache.org/jira/browse/SOLR-7543
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Kevin Watters
> Assignee: Yonik Seeley
> Priority: Minor
> Fix For: 6.0
>
> Attachments: SOLR-7543.patch, SOLR-7543.patch
>
>
> I have a GraphQuery that I implemented a long time back that allows a user to specify a "startQuery" to identify which documents to start graph traversal from. It then gathers up the edge ids for those documents , optionally applies an additional filter. The query is then re-executed continually until no new edge ids are identified. I am currently hosting this code up at https://github.com/kwatters/solrgraph and I would like to work with the community to get some feedback and ultimately get it committed back in as a lucene query.
> Here's a bit more of a description of the parameters for the query / graph traversal:
> q - the initial start query that identifies the universe of documents to start traversal from.
> fromField - the field name that contains the node id
> toField - the name of the field that contains the edge id(s).
> traversalFilter - this is an additional query that can be supplied to limit the scope of graph traversal to just the edges that satisfy the traversalFilter query.
> maxDepth - integer specifying how deep the breadth first search should go.
> returnStartNodes - boolean to determine if the documents that matched the original "q" should be returned as part of the graph.
> onlyLeafNodes - boolean that filters the graph query to only return documents/nodes that have no edges.
> We identify a set of documents with "q" as any arbitrary lucene query. It will collect the values in the fromField, create an OR query with those values , optionally apply an additional constraint from the "traversalFilter" and walk the result set until no new edges are detected. Traversal can also be stopped at N hops away as defined with the maxDepth. This is a BFS (Breadth First Search) algorithm. Cycle detection is done by not revisiting the same document for edge extraction.
> This query operator does not keep track of how you arrived at the document, but only that the traversal did arrive at the document.
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