[SPARK-17338][SQL][FOLLOW-UP] add global temp view

## What changes were proposed in this pull request?

address post hoc review comments for https://github.com/apache/spark/pull/14897

## How was this patch tested?

N/A

Author: Wenchen Fan <wenchen@databricks.com>

Closes #15424 from cloud-fan/global-temp-view.

1 files changed, 5 insertions, 0 deletions

diff --git a/python/pyspark/sql/catalog.py b/python/pyspark/sql/catalog.py
index df3bf4254d..a36d02e0db 100644
--- a/python/pyspark/sql/catalog.py
+++ b/python/pyspark/sql/catalog.py
@@ -169,6 +169,10 @@ class Catalog(object):
     def dropTempView(self, viewName):
         """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.
+        Returns true if this view is dropped successfully, false otherwise.
+
+        Note that, the return type of this method was None in Spark 2.0, but changed to Boolean
+        in Spark 2.1.
 
         >>> spark.createDataFrame([(1, 1)]).createTempView("my_table")
         >>> spark.table("my_table").collect()
@@ -185,6 +189,7 @@ class Catalog(object):
     def dropGlobalTempView(self, viewName):
         """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.
+        Returns true if this view is dropped successfully, false otherwise.
 
         >>> spark.createDataFrame([(1, 1)]).createGlobalTempView("my_table")
         >>> spark.table("global_temp.my_table").collect()