spannerz
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rakyll
Google Cloud Spanner Query Planner Visualizer
Visualizer of spannerz seems not to work for forked operator tree(e.g. union and joins). 
The project might be a better fit for https://github.com/cloudspannerecosystem. Sync with the Ecosystem owners once they are ready for more repos.
Either generate the SVG yourself or convert the visualization to a trace view (easier to implement from scratch and more useful to the user).