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https://issues.apache.org/jira/browse/SOLR-12122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791014#comment-16791014
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Jonathan Nightingale commented on SOLR-12122:
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I'm running into this limitation now myself. Not only on the walk but also the
gather part of the nodes stream definition. I put it up here:
[https://stackoverflow.com/questions/55130208/using-solr-graph-to-traverse-n-relationships]
Is there a path forward for this or is this not something solr plans to support
(I'd think its important for most graph traversal solutions).
Or is there a work around using some other stream functions?
> nodes expression should support multiValued walk target
> -------------------------------------------------------
>
> Key: SOLR-12122
> URL: https://issues.apache.org/jira/browse/SOLR-12122
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: David Smiley
> Priority: Major
>
> The {{nodes}} streaming expression has a {{walk}} argument that articulates a
> pair of Solr fields of the form {{traversalFrom->traversalTo}}. It assumed
> that they are *not* multiValued. It _appears_ not difficult to add
> multiValued support to traversalTo; that's what this issue is about.
> See
> http://lucene.472066.n3.nabble.com/Using-multi-valued-field-in-solr-cloud-Graph-Traversal-Query-td4324379.html
> Note: {{gatherNodes}} appears to be the older name which is still supported.
> It's more commonly known as {{nodes}}. graph-traversal.adoc documents it
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