rdblue commented on a change in pull request #25626: [SPARK-28892][SQL] Add 
UPDATE support for DataSource V2
URL: https://github.com/apache/spark/pull/25626#discussion_r320975158
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
 ##########
 @@ -574,6 +574,21 @@ case class DeleteFromTable(
   override def children: Seq[LogicalPlan] = child :: Nil
 }
 
+/**
+ * Update the data of table that specified with the condition with the given 
updated values.
+ * NOTE: Considering nested fields, we let the type of `attrs` to be 
`Seq[Expression]` becuase
+ * nested fields may be resolved to objects of type like `GetStructField`. 
However, currently
+ * we only support top-level fields, in which case `attrs` is actually of type 
`Seq[Attribute]`.
 
 Review comment:
   @dbtsai, Do we have a long-term plan for tracking nested fields like 
attributes, not just top-level fields?

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