rdblue commented on issue #25626: [SPARK-28892][SQL] Add UPDATE support for 
DataSource V2
URL: https://github.com/apache/spark/pull/25626#issuecomment-527674129
 
 
   @xianyinxin, can you explain the required semantics for your proposed API?
   
   ```
   void updateWhere(Map<String, Expression> sets, Filter[] filters);
   ```
   
   It isn't clear what the requirement for a source would be.
   
   In addition, `Expression` is internal to catalyst and should be removed from 
the API.

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