cloud-fan commented on issue #25507: [SPARK-28667][SQL] Support InsertInto 
through the V2SessionCatalog 
URL: https://github.com/apache/spark/pull/25507#issuecomment-523901465
 
 
   The change LGTM but the tests look a little messy now. What are the 
dimensions we want to test? From a quick look seems we want to test table 
insertion with
   1. SQL API or DataFrameWriter API
   2. with or without v2 session catalog
   3. the table has v1 write fallback capability or not
   
   I expect to see a base testing trait with test cases, and a few concrete 
test suites which extend the base testing trait and set up different 
dimensions. But seems it's not the case here.

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