diff --git a/tests/system-test/2-query/countAlwaysReturnValue.py b/tests/system-test/2-query/countAlwaysReturnValue.py
new file mode 100644
index 0000000000000000000000000000000000000000..25eae49516035b0aa97dc503ae2c911236739590
--- /dev/null
+++ b/tests/system-test/2-query/countAlwaysReturnValue.py
@@ -0,0 +1,125 @@
+import taos
+import sys
+import datetime
+import inspect
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+import random
+
+
+class TDTestCase:
+    updatecfgDict = {"countAlwaysReturnValue":0}
+
+    def init(self, conn, logSql, replicaVar=1):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor(), False)
+
+    def prepare_data(self, dbname="db"):
+        tdSql.execute(
+            f"create database if not exists {dbname} keep 3650 duration 1000")
+        tdSql.execute(f"use {dbname} ")
+        tdSql.execute(
+            f"create table {dbname}.tb (ts timestamp, c0 int)"
+        )
+        tdSql.execute(
+            f"create table {dbname}.stb (ts timestamp, c0 int) tags (t0 int)"
+        )
+        tdSql.execute(
+            f"create table {dbname}.ctb1 using {dbname}.stb tags (1)"
+        )
+        tdSql.execute(
+            f"create table {dbname}.ctb2 using {dbname}.stb tags (2)"
+        )
+
+        tdSql.execute(
+            f"insert into {dbname}.tb values (now(), NULL)")
+
+        tdSql.execute(
+            f"insert into {dbname}.ctb1 values (now(), NULL)")
+
+        tdSql.execute(
+            f"insert into {dbname}.ctb2 values (now() + 1s, NULL)")
+
+    def test_results(self, dbname="db"):
+
+        # count
+        tdSql.query(f"select count(c0) from {dbname}.tb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select count(NULL) from {dbname}.tb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select c0,count(c0) from {dbname}.tb group by c0")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, None)
+
+        tdSql.query(f"select count(c0) from {dbname}.stb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select count(NULL) from {dbname}.stb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select c0,count(c0) from {dbname}.stb group by c0")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, None)
+
+        tdSql.query(f"select tbname,count(c0) from {dbname}.stb partition by tbname")
+        tdSql.checkRows(2)
+        tdSql.checkData(0, 1, None)
+        tdSql.checkData(1, 1, None)
+
+        tdSql.query(f"select count(NULL)")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 0)
+
+        # hyperloglog
+        tdSql.query(f"select hyperloglog(c0) from {dbname}.tb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select hyperloglog(NULL) from {dbname}.tb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select c0,hyperloglog(c0) from {dbname}.tb group by c0")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, None)
+
+        tdSql.query(f"select hyperloglog(c0) from {dbname}.stb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select hyperloglog(NULL) from {dbname}.stb")
+        tdSql.checkRows(0)
+
+        tdSql.query(f"select c0,hyperloglog(c0) from {dbname}.stb group by c0")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, None)
+
+        tdSql.query(f"select tbname,hyperloglog(c0) from {dbname}.stb partition by tbname")
+        tdSql.checkRows(2)
+        tdSql.checkData(0, 1, None)
+        tdSql.checkData(1, 1, None)
+
+        tdSql.query(f"select hyperloglog(NULL)")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 0)
+
+    def run(self):
+        tdSql.prepare()
+
+        tdLog.printNoPrefix("==========step1:prepare data ==============")
+
+        self.prepare_data()
+
+        tdLog.printNoPrefix("==========step2:test results ==============")
+
+        self.test_results()
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
diff --git a/tests/system-test/2-query/hyperloglog.py b/tests/system-test/2-query/hyperloglog.py
index eff687cba71b7adaf415f46e27b5047c13913bbc..a139cc19af885b3b31b45fc3523b14b2183c8837 100644
--- a/tests/system-test/2-query/hyperloglog.py
+++ b/tests/system-test/2-query/hyperloglog.py
@@ -28,7 +28,7 @@ ALL_COL = [ INT_COL, BINT_COL, SINT_COL, TINT_COL, FLOAT_COL, DOUBLE_COL, BOOL_C
 DBNAME = "db"
 
 class TDTestCase:
-    
+
     updatecfgDict = {"maxTablesPerVnode":2 ,"minTablesPerVnode":2,"tableIncStepPerVnode":2 }
 
     def init(self, conn, logSql, replicaVar=1):
diff --git a/tests/system-test/fulltest.sh b/tests/system-test/fulltest.sh
index c65c574e7c068fa71f57c372020793c55aca6729..3bbf3096a45494e2fefe161190bfda08fb0c64b9 100755
--- a/tests/system-test/fulltest.sh
+++ b/tests/system-test/fulltest.sh
@@ -17,7 +17,7 @@ python3 ./test.py -f 0-others/taosdShell.py -N 5 -M 3 -Q 3
 python3 ./test.py -f 0-others/sysinfo.py
 python3 ./test.py -f 0-others/user_control.py
 python3 ./test.py -f 0-others/fsync.py
-python3 ./test.py  -f 0-others/compatibility.py   
+python3 ./test.py  -f 0-others/compatibility.py
 python3 ./test.py -f 1-insert/alter_database.py
 python3 ./test.py -f 1-insert/influxdb_line_taosc_insert.py
 python3 ./test.py -f 1-insert/opentsdb_telnet_line_taosc_insert.py
@@ -76,6 +76,8 @@ python3 ./test.py -f 2-query/count_partition.py
 python3 ./test.py -f 2-query/count_partition.py -R
 python3 ./test.py -f 2-query/count.py
 python3 ./test.py -f 2-query/count.py -R
+python3 ./test.py -f 2-query/countAlwaysReturnValue.py
+python3 ./test.py -f 2-query/countAlwaysReturnValue.py -R
 python3 ./test.py -f 2-query/db.py
 python3 ./test.py -f 2-query/db.py -R
 python3 ./test.py -f 2-query/diff.py
@@ -383,6 +385,7 @@ python3 ./test.py -f 2-query/Today.py -Q 2
 python3 ./test.py -f 2-query/max.py -Q 2
 python3 ./test.py -f 2-query/min.py -Q 2
 python3 ./test.py -f 2-query/count.py -Q 2
+python3 ./test.py -f 2-query/countAlwaysReturnValue.py -Q 2
 python3 ./test.py -f 2-query/last.py -Q 2
 python3 ./test.py -f 2-query/first.py -Q 2
 python3 ./test.py -f 2-query/To_iso8601.py -Q 2
@@ -478,6 +481,7 @@ python3 ./test.py -f 2-query/Today.py -Q  3
 python3 ./test.py -f 2-query/max.py -Q  3
 python3 ./test.py -f 2-query/min.py -Q  3
 python3 ./test.py -f 2-query/count.py -Q  3
+python3 ./test.py -f 2-query/countAlwaysReturnValue.py -Q 3
 python3 ./test.py -f 2-query/last.py -Q  3
 python3 ./test.py -f 2-query/first.py -Q  3
 python3 ./test.py -f 2-query/To_iso8601.py -Q  3
@@ -575,6 +579,7 @@ python3 ./test.py -f 2-query/Today.py -Q  4
 python3 ./test.py -f 2-query/max.py -Q  4
 python3 ./test.py -f 2-query/min.py -Q  4
 python3 ./test.py -f 2-query/count.py -Q  4
+python3 ./test.py -f 2-query/countAlwaysReturnValue.py -Q 4
 python3 ./test.py -f 2-query/last.py -Q  4
 python3 ./test.py -f 2-query/first.py -Q  4
 python3 ./test.py -f 2-query/To_iso8601.py -Q  4
@@ -590,7 +595,7 @@ python3 ./test.py -f 2-query/apercentile.py -Q  4
 python3 ./test.py -f 2-query/abs.py -Q  4
 python3 ./test.py -f 2-query/ceil.py -Q  4
 python3 ./test.py -f 2-query/floor.py -Q  4
-python3 ./test.py -f 2-query/round.py -Q  4 
+python3 ./test.py -f 2-query/round.py -Q  4
 python3 ./test.py -f 2-query/log.py -Q  4
 python3 ./test.py -f 2-query/pow.py -Q  4
 python3 ./test.py -f 2-query/sqrt.py -Q  4