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https://issues.apache.org/jira/browse/CALCITE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197365#comment-17197365
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Liya Fan commented on CALCITE-4197:
-----------------------------------
To make discussions clearer, I have opened another issue (CALCITE-4260) as a
child issue of this one.
Let's move discussions related to extending plan explain there.
> Provide utility to visualize RelNode plans
> ------------------------------------------
>
> Key: CALCITE-4197
> URL: https://issues.apache.org/jira/browse/CALCITE-4197
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.26.0
>
> Attachments: screenshot-1.png, screenshot-2.png, screenshot-3.png,
> screenshot-4.png, screenshot-5.png, screenshot-6.png, screenshot-7.png
>
> Time Spent: 4h
> Remaining Estimate: 0h
>
> From time to time, we want to visualize the plan generated the optimizer as a
> DAG (Directed Acyclic Graph). This gives us an overview of the plan, and
> helps us to find problems with the plan quickly.
> A common way to visualize a DAG is to dump it in the {{dot}} format, and then
> display the DAG through GraphViz. Currently, we already have a utility to
> dump the Volcano planner in dot format. In this issue, we want to dump a
> RelNode plan (a RelNode DAG) in the dot format, which will help users to see
> their plans more clearly.
> The utility should have some options that allow users to specify the
> visuzalization details, for example:
> 1. the max length of a node description.
> 2. whether RelSubset/HepRelVertex should be displayed.
> 3. Nodes that should be highlighted.
> Could you please give some feedback?
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