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https://issues.apache.org/jira/browse/SOLR-12122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16405627#comment-16405627
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Joel Bernstein commented on SOLR-12122:
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Point taken on the comments. No more new expressions are going in until a
refactoring takes. I will add javadoc as part of this refactoring. The point of
the refactoring to make it easier for other people to contribute. There is also
very large documentation effort underway provide user guide for the Math
Expressions. You can the see the work in progress here:
[https://github.com/joel-bernstein/lucene-solr/blob/math_expressions_documentation/solr/solr-ref-guide/src/math-expressions.adoc]
There is vast amount of functionality now in Streaming Expressions. My main
focus for the 7.4 release is refactoring and documenting.
> 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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