jorisvandenbossche commented on pull request #8912:
URL: https://github.com/apache/arrow/pull/8912#issuecomment-820499099


   Rebased now.
   
   @lidavidm I am still a bit in doubt about the exact API. 
   For example, R has a `unify_schemas` keyword in their `open_dataset` 
function (https://arrow.apache.org/docs/r/reference/open_dataset.html). I find 
that name a bit more descriptive for the use case of "infer schema by checking 
all fragments", since then in practice it unifies the schema of all fragments 
(while with the current PR, you get that by using `validate_schema=True`). 
   On the other hand, R doesn't (currently) give a way to validate a specified 
schema, but not sure how useful that is in practice (since you would get the 
same error when starting to scan as well, if the specified schema doesn't 
match).
    
   


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