beliefer commented on code in PR #44119:
URL: https://github.com/apache/spark/pull/44119#discussion_r1432675303


##########
sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:
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@@ -4129,6 +4129,36 @@ class Dataset[T] private[sql](
     new DataFrameWriterV2[T](table, this)
   }
 
+  /**
+   * Create a [[MergeIntoWriter]] for MergeInto action.

Review Comment:
   The key is the `MergeIntoWriter` is public API or developer API.
   cc @cloud-fan 



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