rdblue commented on a change in pull request #24469: [SPARK-27576][SQL] table 
capability to skip the output column resolution
URL: https://github.com/apache/spark/pull/24469#discussion_r284493793
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/NamedRelation.scala
 ##########
 @@ -21,4 +21,7 @@ import 
org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
 
 trait NamedRelation extends LogicalPlan {
   def name: String
+
+  // When true, the schema of input data must match the schema of this 
relation, during write.
+  def requireSchemaMatch: Boolean = true
 
 Review comment:
   @cloud-fan, we may want to keep `NamedRelation` to be able to use 
`UnresolvedRelation` in v2 plans. If we updated `AppendData` (for example) to 
use `DataSourceV2Relation`, then we would not be able to create it with an 
`UnresolvedRelation` and delegate resolving the table to the analyzer.

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