Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r93993539
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -377,6 +378,36 @@ case class InsertIntoTable(
override lazy val resolved: Boolean = childrenResolved && table.resolved
}
+/** Factory for constructing new `View` nodes. */
+object View {
+ def apply(desc: CatalogTable): View = View(desc,
desc.schema.toAttributes, None)
+}
+
+/**
+ * A container for holding the view description(CatalogTable), and the
output of the view. The
+ * child will be defined if the view is defined in a Hive metastore or the
view is resolved,
+ * else it should be None.
+ * This operator will be removed at the end of analysis stage.
+ *
+ * @param desc A view description(CatalogTable) that provides necessary
information to resolve the
+ * view.
+ * @param output The output of a view operator, this is generated during
planning the view, so that
+ * we are able to decouple the output from the underlying
structure.
+ * @param child The logical plan of a view operator, it should be
non-empty if the view is defined
+ * in a Hive metastore or the view is resolved, else it
should be None.
+ */
+case class View(
+ desc: CatalogTable,
+ output: Seq[Attribute],
+ child: Option[LogicalPlan] = None) extends LogicalPlan with
MultiInstanceRelation {
+
+ override lazy val resolved: Boolean = child.exists(_.resolved)
+
+ override def children: Seq[LogicalPlan] = child.toSeq
+
+ override def newInstance(): LogicalPlan = copy(output =
output.map(_.newInstance()))
+}
--- End diff --
We also need to add `override def simpleString`, which is used for `ONE
line description of this node`. Currently, we output the whole `CatalogTable`.
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