alamb opened a new pull request, #7944:
URL: https://github.com/apache/arrow-datafusion/pull/7944

   I have long been bothered by the amount of copying required in DFSchema and 
how akward it is to use 
   
   The current setup also makes adding additional indexes such as described on 
https://github.com/apache/arrow-datafusion/issues/7698 very hard 
   
   This PR is part of a plan to review the current implementation and possibly  
simplify it / prepare for faster DataFusion planning


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