Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14897#discussion_r82658617
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/catalog/Catalog.scala ---
@@ -262,15 +262,33 @@ abstract class Catalog {
options: Map[String, String]): DataFrame
/**
- * Drops the temporary view with the given view name in the catalog.
+ * Drops the local temporary view with the given view name in the
catalog.
* If the view has been cached before, then it will also be uncached.
*
+ * Local temporary view is session-scoped. 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.
+ *
* @param viewName the name of the view to be dropped.
* @since 2.0.0
*/
def dropTempView(viewName: String): Unit
/**
+ * Drops the global temporary view with the given view name in the
catalog.
+ * If the view has been cached before, then it will also be uncached.
+ *
+ * Global temporary view is cross-session. Its lifetime is the lifetime
of the Spark application,
+ * i.e. it will be automatically dropped when the application
terminates. It's tied to a system
+ * preserved database `_global_temp`, and we must use the qualified name
to refer a global temp
+ * view, e.g. `SELECT * FROM _global_temp.view1`.
+ *
+ * @param viewName the name of the view to be dropped.
+ * @since 2.1.0
+ */
+ def dropGlobalTempView(viewName: String): Boolean
--- End diff --
need to explain the return type
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