westonpace commented on issue #15280:
URL: https://github.com/apache/arrow/issues/15280#issuecomment-1479522711

   > @ildipo where does substrait uses dataset? (This is slightly surprising to 
me because I thought substrait code mostly just read in substrait plan protobuf 
and turn into an Acero declaration)
   
   @icexelloss the `scan` and `write` nodes are provided by datasets.  You can 
use `source` (e.g. an in-memory source) with plain Acero but if you want to 
scan files you need datasets.  Substrait's `ReadRel` when `LocalFiles` will use 
a `scan` node.


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