jizezhang opened a new issue, #18893:
URL: https://github.com/apache/datafusion/issues/18893

   A follow-up on https://github.com/apache/datafusion/issues/17297. This PR 
https://github.com/apache/datafusion/pull/18688 adds the feature to allow user 
to create a custom logical plan for `DataFrame::cache` by registering a logical 
plan transformation via `CacheFactory`. To translate that into a physical plan, 
user needs to have their own `ExtensionPlanner` and/or `QueryPlanner`. Add an 
example demonstrating how to do that.


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