rdblue commented on a change in pull request #24233: [SPARK-26356][SQL] remove 
SaveMode from data source v2
URL: https://github.com/apache/spark/pull/24233#discussion_r271023428
 
 

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 File path: 
sql/core/src/main/java/org/apache/spark/sql/sources/v2/TableProvider.java
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 @@ -24,7 +24,7 @@
 
 /**
  * The base interface for v2 data sources which don't have a real catalog. 
Implementations must
- * have a public, 0-arg constructor.
+ * have a public, 0-arg constructor, and can only deal with existing tables.
 
 Review comment:
   The phrase "deal with" is not very specific. I think it would be better to 
say what these tables can be used for: data operations like read, append, 
delete, and overwrite. Not operations that require metadata changes.

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