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).