diff --git a/source/libs/function/CMakeLists.txt b/source/libs/function/CMakeLists.txt
index 9d11d7b376..147f697302 100644
--- a/source/libs/function/CMakeLists.txt
+++ b/source/libs/function/CMakeLists.txt
@@ -79,6 +79,26 @@ ENDIF ()
 target_link_libraries(
     udf1 PUBLIC os ${LINK_JEMALLOC})
 
+
+add_library(udf1_dup STATIC MODULE test/udf1_dup.c)
+target_include_directories(
+        udf1_dup
+        PUBLIC
+            "${TD_SOURCE_DIR}/include/libs/function"
+            "${TD_SOURCE_DIR}/include/util"
+            "${TD_SOURCE_DIR}/include/common"
+            "${TD_SOURCE_DIR}/include/client"
+            "${TD_SOURCE_DIR}/include/os"
+        PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
+)
+
+IF (TD_LINUX_64 AND JEMALLOC_ENABLED)
+    ADD_DEPENDENCIES(udf1_dup jemalloc)
+ENDIF ()
+
+target_link_libraries(
+    udf1_dup PUBLIC os ${LINK_JEMALLOC})
+
 add_library(udf2 STATIC MODULE test/udf2.c)
 target_include_directories(
         udf2
diff --git a/source/libs/function/test/udf1_dup.c b/source/libs/function/test/udf1_dup.c
new file mode 100644
index 0000000000..71d7ebc58a
--- /dev/null
+++ b/source/libs/function/test/udf1_dup.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef LINUX
+#include <unistd.h>
+#endif
+#ifdef WINDOWS
+#include <windows.h>
+#endif
+#include "taosudf.h"
+
+
+DLL_EXPORT int32_t udf1_init() { return 0; }
+
+DLL_EXPORT int32_t udf1_destroy() { return 0; }
+
+DLL_EXPORT int32_t udf1(SUdfDataBlock *block, SUdfColumn *resultCol) {
+  SUdfColumnData *resultData = &resultCol->colData;
+  for (int32_t i = 0; i < block->numOfRows; ++i) {
+    int j = 0;
+    for (; j < block->numOfCols; ++j) {
+      if (udfColDataIsNull(block->udfCols[j], i)) {
+        udfColDataSetNull(resultCol, i);
+        break;
+      }
+    }
+    if (j == block->numOfCols) {
+      int32_t luckyNum = 2;
+      udfColDataSet(resultCol, i, (char *)&luckyNum, false);
+    }
+  }
+  // to simulate actual processing delay by udf
+#ifdef LINUX
+  usleep(1 * 1000);  // usleep takes sleep time in us (1 millionth of a second)
+#endif
+#ifdef WINDOWS
+  Sleep(1);
+#endif
+  resultData->numOfRows = block->numOfRows;
+  return 0;
+}
+
diff --git a/tests/system-test/0-others/udf_create.py b/tests/system-test/0-others/udf_create.py
index f467e802ac..398d746a9b 100644
--- a/tests/system-test/0-others/udf_create.py
+++ b/tests/system-test/0-others/udf_create.py
@@ -47,14 +47,18 @@ class TDTestCase:
 
         if platform.system().lower() == 'windows':
             self.libudf1 = subprocess.Popen('(for /r %s %%i in ("udf1.d*") do @echo %%i)|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
+            self.libudf1_dup = subprocess.Popen('(for /r %s %%i in ("udf1_dup.d*") do @echo %%i)|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
             self.libudf2 = subprocess.Popen('(for /r %s %%i in ("udf2.d*") do @echo %%i)|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
             if (not tdDnodes.dnodes[0].remoteIP == ""):
                 tdDnodes.dnodes[0].remote_conn.get(tdDnodes.dnodes[0].config["path"]+'/debug/build/lib/libudf1.so',projPath+"\\debug\\build\\lib\\")
+                tdDnodes.dnodes[0].remote_conn.get(tdDnodes.dnodes[0].config["path"]+'/debug/build/lib/libudf1_dup.so',projPath+"\\debug\\build\\lib\\")
                 tdDnodes.dnodes[0].remote_conn.get(tdDnodes.dnodes[0].config["path"]+'/debug/build/lib/libudf2.so',projPath+"\\debug\\build\\lib\\")
                 self.libudf1 = self.libudf1.replace('udf1.dll','libudf1.so')
+                self.libudf1 = self.libudf1.replace('udf1.dll','libudf1_dup.so')
                 self.libudf2 = self.libudf2.replace('udf2.dll','libudf2.so')
         else:
             self.libudf1 = subprocess.Popen('find %s -name "libudf1.so"|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
+            self.libudf1_dup = subprocess.Popen('find %s -name "libudf1_dup.so"|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
             self.libudf2 = subprocess.Popen('find %s -name "libudf2.so"|grep lib|head -n1'%projPath , shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT).stdout.read().decode("utf-8")
         self.libudf1 = self.libudf1.replace('\r','').replace('\n','')
         self.libudf2 = self.libudf2.replace('\r','').replace('\n','')
@@ -174,6 +178,7 @@ class TDTestCase:
 
         # create  scalar functions
         tdSql.execute("create function udf1 as '%s' outputtype int;"%self.libudf1)
+        tdSql.execute("create function udf1_dup as '%s' outputtype int;"%self.libudf1_dup)
 
         # create aggregate functions
 
@@ -188,6 +193,13 @@ class TDTestCase:
 
         # scalar functions
 
+        # udf1_dup
+        tdSql.query("select num1 , udf1(num1) ,udf1_dup(num1) from tb")
+        tdSql.checkData(1,0,1)
+        tdSql.checkData(1,1,2)
+        tdSql.checkData(2,0,1)
+        tdSql.checkData(2,1,2)
+
         tdSql.execute("use db ")
         tdSql.query("select num1 , udf1(num1) ,num2 ,udf1(num2),num3 ,udf1(num3),num4 ,udf1(num4) from tb")
         tdSql.checkData(0,0,None)