feat: update query stats samples (#373)

Author: larkee

samples/samples/snippets.py

@@ -1703,7 +1703,10 @@ def query_data_with_query_options(instance_id, database_id):
     with database.snapshot() as snapshot:
         results = snapshot.execute_sql(
             "SELECT VenueId, VenueName, LastUpdateTime FROM Venues",
-            query_options={"optimizer_version": "1"},
+            query_options={
+                "optimizer_version": "1",
+                "optimizer_statistics_package": "latest"
+            },
         )
 
         for row in results:
@@ -1716,7 +1719,11 @@ def create_client_with_query_options(instance_id, database_id):
     # [START spanner_create_client_with_query_options]
     # instance_id = "your-spanner-instance"
     # database_id = "your-spanner-db-id"
-    spanner_client = spanner.Client(query_options={"optimizer_version": "1"})
+    spanner_client = spanner.Client(
+        query_options={
+            "optimizer_version": "1",
+            "optimizer_statistics_package": "auto_20191128_14_47_22UTC"
+        })
     instance = spanner_client.instance(instance_id)
     database = instance.database(database_id)