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https://issues.apache.org/jira/browse/SOLR-8918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15248988#comment-15248988
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Dennis Gove commented on SOLR-8918:
-----------------------------------

I've found the problem and in doing so developed a slight dislike for angular 
(but really it was my own fault because I know all about javascript global 
states and what not).

stream.js was created from a copy of cloud.js. cloud.js created a global 
variable called graphSubController. When I was mucking around with stream.js I 
kept the graphSubController global variable but re-implemented it. Now, when 
angular runs it will process all the .js files and in doing so the 
stream.js::graphSubController replaced cloud.js::graphSubController so the 
correct sub controller was not being called from the cloud.js code page.

I'll have a patch to fix this in a little bit - after I go and cleanup all the 
alerts I added to figure out what in the world was going on.

(in reality though, it was pretty fun to learn-ish angular for this)

> Add Streaming Expressions to the admin page
> -------------------------------------------
>
>                 Key: SOLR-8918
>                 URL: https://issues.apache.org/jira/browse/SOLR-8918
>             Project: Solr
>          Issue Type: New Feature
>          Components: UI, web gui
>            Reporter: Dennis Gove
>         Attachments: SOLR-8918.patch, SOLR-8918.patch, SOLR-8918.patch, 
> SOLR-8918.patch, SOLR-8918.patch, sample-display.png, sample-display.png
>
>
> Add to the admin page an ability to work with and view Streaming Expressions.
> This tab will appear under the Collection selection section and will work 
> similarly to the Query tab. On this page the user will be able to enter a 
> streaming expression for execution. The user can then execute the expression 
> against the collection and view all the results as they are returned from the 
> Stream handler. Along with this the user will be able to view the structure 
> of the expression in a graph-like layout. 
> If the user wishes to only view the expression structure without executing 
> the expression the user will be able to click an "Explain" button which will 
> show the structure. Included in the structure will be information about each 
> node (the expression for that node).



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