jorgecarleitao opened a new pull request #9333:
URL: https://github.com/apache/arrow/pull/9333


   This PR adds support for custom [logical] optimization rules to be injected 
to the `ExecutionContext`, thereby allowing people to create their own 
optimizers and run them through the logical plan during the optimization step.
   
   Another way of thinking about this is that `QueryPlanner` is now only 
responsible for converting a logical plan into an execution plan, while the 
`optimizerRule` is responsible for re-writing a logical plan into a logical 
plan:
   
   * `OptimizerRule`: `LogicalPlan -> LogicalPlan`
   * `QueryPlanner`: `LogicalPlan -> ExecutionPlan`
   
   The second commit on this PR is just a small simplification that helps 
people writing the rules without having to worry about the `Explain`. This is 
important because forgetting about it has major consequences to UX (explain 
does not work as intended)


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