backkem commented on issue #970:
URL: 
https://github.com/apache/arrow-datafusion/issues/970#issuecomment-1885576482

   Technically, I agree it can already be done. However, having a canonical 
approach for this creates a focus point for creators of the 
`FederatedTableSource`s to target. Making it easy to plug different sources 
into the engine, as the `TableProvider` enables today. It can also silences the 
individual 'xyz pushdown' discussions that seem to keep popping up. This latter 
point makes me lean towards addressing this in datafusion itself versus a 
separate project. More advanced providers such as a SQLite or MySQL one can 
live in contrib or their own crate.


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