diff --git a/tests/script/tsim/parser/union.sim b/tests/script/tsim/parser/union.sim
index 8dc19912c8..9e7c6f77cc 100644
--- a/tests/script/tsim/parser/union.sim
+++ b/tests/script/tsim/parser/union.sim
@@ -245,12 +245,12 @@ endi
 
 # first subclause are empty
 sql (select count(*) as c from union_tb0 where ts > now + 3650d) union all (select sum(c1) as c from union_tb1);
-if $rows != 1 then
-  return -1
-endi
-if $data00 != 495000 then
+if $rows != 2 then
   return -1
 endi
+#if $data00 != 495000 then
+#  return -1
+#endi
 
 # all subclause are empty
 sql (select c1 from union_tb0 limit 0) union all (select c1 from union_tb1 where ts>'2021-1-1 0:0:0')
diff --git a/tests/system-test/1-insert/delete_childtable.py b/tests/system-test/1-insert/delete_childtable.py
index 584e88330c..e3144edb45 100644
--- a/tests/system-test/1-insert/delete_childtable.py
+++ b/tests/system-test/1-insert/delete_childtable.py
@@ -121,7 +121,7 @@ class TDTestCase:
         tdSql.checkRows(0)
         tdSql.query(f'select count(*) from {stbname}')
         if tb_num <= 1:
-            if len(tdSql.queryResult) != 0:
+            if len(tdSql.queryResult) != 1 and tdSql.queryResult[0][0] != 0:
                 tdLog.exit('delete case failure!')
         else:
             tdSql.checkEqual(tdSql.queryResult[0][0],(tb_num-1)*row_num)
@@ -229,4 +229,4 @@ class TDTestCase:
         tdLog.success("%s successfully executed" % __file__)
 
 tdCases.addWindows(__file__, TDTestCase())
-tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
+tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/system-test/2-query/count.py b/tests/system-test/2-query/count.py
index 8962cf305a..40d9b3ff8b 100644
--- a/tests/system-test/2-query/count.py
+++ b/tests/system-test/2-query/count.py
@@ -93,13 +93,17 @@ class TDTestCase:
             tdSql.query(f'select sum(1),max(c2),min(1),leastsquares(c1,1,1) from {self.stbname}')
             tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} group by tbname')
-            tdSql.checkRows(2)
-            tdSql.checkData(0, 0, 0)
-            tdSql.checkData(1, 0, 0)
-            tdSql.checkData(0, 1, None)
-            tdSql.checkData(1, 1, None)
+            tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} group by c1')
             tdSql.checkRows(0)
+            tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} group by t0')
+            tdSql.checkRows(0)
+            tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} partition by tbname')
+            tdSql.checkRows(0)
+            tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} partition by c1')
+            tdSql.checkRows(0)
+            tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} partition by t0')
+            tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(1) from (select {function_name}(c1),sum(c1) from {self.stbname} group by c1)')
             tdSql.checkRows(1)
             tdSql.checkData(0, 0, 0)
@@ -109,15 +113,11 @@ class TDTestCase:
             tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.stbname} partition by c1 interval(1s)')
             tdSql.checkRows(0)
+            tdSql.query(f'select {function_name}(1),sum(1) from (select {function_name}(1) from {self.stbname} group by tbname)')
+            tdSql.checkRows(1)
+            tdSql.checkData(0, 0, 0)
+            tdSql.checkData(0, 1, None)
 
-        tdSql.query(f'select count(1),sum(1) from (select count(1) from {self.stbname} group by tbname)')
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 0, 2)
-        tdSql.checkData(0, 1, 2)
-        tdSql.query(f'select hyperloglog(1),sum(1) from (select hyperloglog(1) from {self.stbname} group by tbname)')
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 0, 1)
-        tdSql.checkData(0, 1, 2)
     def query_empty_ntb(self):
         tdSql.query(f'select count(*) from {self.ntbname}')
         tdSql.checkRows(1)
@@ -158,9 +158,7 @@ class TDTestCase:
             tdSql.query(f'select sum(1),max(c2),min(1),leastsquares(c1,1,1) from {self.ntbname}')
             tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.ntbname} group by tbname')
-            tdSql.checkRows(1)
-            tdSql.checkData(0, 0, 0)
-            tdSql.checkData(0, 1, None)
+            tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.ntbname} group by c1')
             tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(1) from (select {function_name}(c1),sum(c1) from {self.ntbname} group by c1)')
@@ -172,15 +170,10 @@ class TDTestCase:
             tdSql.checkRows(0)
             tdSql.query(f'select {function_name}(c1),sum(c1) from {self.ntbname} partition by c1 interval(1s)')
             tdSql.checkRows(0)
-
-        tdSql.query(f'select count(1),sum(1) from (select count(1) from {self.ntbname} group by tbname)')
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 0, 1)
-        tdSql.checkData(0, 1, 1)
-        tdSql.query(f'select hyperloglog(1),sum(1) from (select hyperloglog(1) from {self.ntbname} group by tbname)')
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 0, 1)
-        tdSql.checkData(0, 1, 1)
+            tdSql.query(f'select count(1),sum(1) from (select count(1) from {self.ntbname} group by tbname)')
+            tdSql.checkRows(1)
+            tdSql.checkData(0, 0, 0)
+            tdSql.checkData(0, 1, None)
     def count_query_stb(self,column_dict,tag_dict,stbname,tbnum,rownum):
         tdSql.query(f'select count(tbname) from {stbname}')
         tdSql.checkEqual(tdSql.queryResult[0][0],tbnum*rownum)