cloud-fan commented on issue #26464: [SPARK-29835] Remove the unnecessary 
conversion from Statement to LogicalPlan for DELETE/UPDATE
URL: https://github.com/apache/spark/pull/26464#issuecomment-552490569
 
 
   For UPDATE, it has no implementation and I don't think we need to detect v1 
tables and fail.
   
   For DELETE, we can check in the planner: if table is not 
`DataSourceV2Relation`, fail and say v1 table is not supported.

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