tomvanbussel opened a new pull request, #40590:
URL: https://github.com/apache/spark/pull/40590

   ### What changes were proposed in this pull request?
   This PR is a follow-up to https://github.com/apache/spark/pull/40234, which 
makes it possible for extensions to create custom `Dataset`s and `Column`s. It 
exposes `Dataset.plan`, but unfortunately it does not expose `Column.expr`. 
This means that extensions cannot build custom `Column`s that provide a user 
provider `Column` as input.
   
   ### Why are the changes needed?
   See above.
   
   ### Does this PR introduce _any_ user-facing change?
   No. This only adds a change for a Developer API.
   
   
   ### How was this patch tested?
   Existing tests to make sure nothing breaks.
   


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