Github user clockfly commented on a diff in the pull request:
https://github.com/apache/spark/pull/14897#discussion_r77264967
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala ---
@@ -25,7 +25,41 @@ import
org.apache.spark.sql.catalyst.catalog.{CatalogStorageFormat, CatalogTable
import org.apache.spark.sql.catalyst.expressions.Alias
import org.apache.spark.sql.catalyst.plans.QueryPlan
import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, Project}
-import org.apache.spark.sql.types.StructType
+import org.apache.spark.sql.types.MetadataBuilder
+
+
+/**
+ * ViewType is used to specify the expected view type when we want to
create or replace a view in
+ * [[CreateViewCommand]].
+ */
+sealed trait ViewType
+
+/**
+ * LocalTempView means session-scoped local temporary views. Its lifetime
is the lifetime of the
+ * session that created it, i.e. it will be automatically dropped when the
session terminates. It's
+ * not tied to any databases, i.e. we can't use `db1.view1` to reference a
local temporary view.
+ */
+object LocalTempView extends ViewType
+
+/**
+ * GlobalTempView means cross-session global temporary views. Its lifetime
is the lifetime of the
+ * Spark application, i.e. it will be automatically dropped when the
application terminates. It's
+ * not tied to any databases, i.e. we can't use `db1.view1` to reference a
global temporary view.
+ *
+ * Note that, Existing global temp view with the same name are not visible
to the current session
--- End diff --
If a local temporary view with the same name exists, then the global
temporary view is not visible.
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