[GitHub] [spark] cloud-fan commented on a change in pull request #24570: [SPARK-24923][SQL] Implement v2 CreateTableAsSelect

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cloud-fan commented on a change in pull request #24570: [SPARK-24923][SQL] Implement v2 CreateTableAsSelect
URL: https://github.com/apache/spark/pull/24570#discussion_r283222709
 
 

 ##########
 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
 ##########
 @@ -402,6 +404,35 @@ trait V2WriteCommand extends Command {
   }
 }
 
+/**
+ * Create a new table from a select query with a v2 catalog.
+ */
+case class CreateTableAsSelect(
+    catalog: TableCatalog,
+    tableName: Identifier,
+    partitioning: Seq[Transform],
+    query: LogicalPlan,
+    properties: Map[String, String],
+    writeOptions: Map[String, String],
+    ignoreIfExists: Boolean) extends Command {
+
+  override def children: Seq[LogicalPlan] = Seq(query)
+
+  override lazy val resolved: Boolean = {
+    // the table schema is created from the query schema, so the only resolution needed is to check
+    // that the columns referenced by the table's partitioning exist in the query schema
+    val references = partitioning.flatMap(_.references).toSet
+    references.map(_.fieldNames).forall { column =>
+      query.schema.findNestedField(column).map(_.dataType) match {
 
 Review comment:
   ditto

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