dstandish commented on pull request #19596:
URL: https://github.com/apache/airflow/pull/19596#issuecomment-970495398


   >  I mean, GenericTransfer is meant to be used for small datasets anyway as 
it works in-mem
   
   Yeah I wasn't aware of that, this is my first look at generic transfer. 
   
   > so I can imagine there are cases where doing say truncate & insert all is 
just fine instead of replace
   
   Yeah this is one of the challenges with trying to build an interface like 
this.  Replace can mean "replace rows (i.e. when collision by PK)" or "replace 
table".  And in the base implementation, it means by row.  But you are talking 
by table.  So there's ambiguity.


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