Github user rdblue commented on the issue:

    https://github.com/apache/spark/pull/21946
  
    @cloud-fan, from your comment around the same time as mine, it sounds like 
the confusion may just be in how you're updating the current API to the 
proposed one. Can you post a migration plan? It sounds like something like this:
    
    `ReadSupport` and `ReadSupportWithSchema` -> `BatchReadSupportProvider`
    `DataSourceReader` -> `ReadSupport`
    
    Is that right? The re-use of `ReadSupport` would explain the confusion on 
my end.


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