Liya Fan created CALCITE-4197:
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Summary: 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
>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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