diff --git a/test/CDB_OverviewsTest.sql b/test/CDB_OverviewsTest.sql
index 49aadae..2ef99ae 100644
--- a/test/CDB_OverviewsTest.sql
+++ b/test/CDB_OverviewsTest.sql
@@ -8,12 +8,20 @@ SELECT _CDB_Aggregated_Attributes_Expression('base_bare_t'::regclass);
 SELECT _CDB_Aggregated_Attributes_Expression('base_bare_t'::regclass, 'tab');
 
 SELECT CDB_CreateOverviews('base_bare_t'::regclass);
+SELECT count(*) FROM base_bare_t_ov5;
+
 
 SELECT _CDB_Aggregable_Attributes_Expression('base_t'::regclass);
 SELECT _CDB_Aggregated_Attributes_Expression('base_t'::regclass);
 SELECT _CDB_Aggregated_Attributes_Expression('base_t'::regclass, 'tab');
 
 SELECT CDB_CreateOverviews('base_t'::regclass);
+SELECT count(*) FROM base_t_ov5;
+
+
+SELECT CDB_DropOverviews('base_bare_t'::regclass);
+SELECT CDB_DropOverviews('base_t'::regclass);
+SELECT count(*) FROM base_t_ov5;
 
 DROP TABLE base_bare_t;
 DROP TABLE base_t;
diff --git a/test/CDB_OverviewsTest_expect b/test/CDB_OverviewsTest_expect
index d18d82d..29d79a7 100644
--- a/test/CDB_OverviewsTest_expect
+++ b/test/CDB_OverviewsTest_expect
@@ -6,10 +6,17 @@ INSERT 0 1114
 
 
 
-{base_bare_t_ov5,base_bare_t_ov3,base_bare_t_ov1}
+{base_bare_t_ov5,base_bare_t_ov4,base_bare_t_ov3,base_bare_t_ov2,base_bare_t_ov1,base_bare_t_ov0}
+125
 number,int_number,name,start
-AVG(number)::double precision AS number,AVG(int_number)::integer AS int_number,''::text AS name,NULL::date AS start
-AVG(tab.number)::double precision AS number,AVG(tab.int_number)::integer AS int_number,''::text AS name,NULL::date AS start
-{base_t_ov5,base_t_ov3,base_t_ov1}
+AVG(number)::double precision AS number,AVG(int_number)::integer AS int_number,CASE count(*) WHEN 1 THEN string_agg(name,'/') ELSE '*' END::text AS name,CASE count(*) WHEN 1 THEN MIN(start) ELSE NULL END::date AS start
+AVG(tab.number)::double precision AS number,AVG(tab.int_number)::integer AS int_number,CASE count(*) WHEN 1 THEN string_agg(tab.name,'/') ELSE '*' END::text AS name,CASE count(*) WHEN 1 THEN MIN(tab.start) ELSE NULL END::date AS start
+{base_t_ov5,base_t_ov4,base_t_ov3,base_t_ov2,base_t_ov1,base_t_ov0}
+125
+
+
+ERROR:  relation "base_t_ov5" does not exist
+LINE 1: SELECT count(*) FROM base_t_ov5;
+                             ^
 DROP TABLE
 DROP TABLE