diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index 13233c4964109b80f0ae552d8e37ee8341ab5ebd..0b309bc8f56abd3870a07eebdb94e61f357ee23c 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -853,8 +853,15 @@ int32_t convertScalarParamToDataBlock(SScalarParam *input, int32_t numOfCols, SS
       if (isNull) {
         colDataAppendNNULL(pColInfoData, startRow, expandRows);
       } else {
-        char* data = colDataGetData(pColInfoData, (input + i)->numOfRows - 1);
-        colDataAppendNItems(pColInfoData, startRow, data, expandRows);
+        char* src = colDataGetData(pColInfoData, (input + i)->numOfRows - 1);
+        int32_t bytes = pColInfoData->info.bytes;
+        char* data = taosMemoryMalloc(bytes);
+        memcpy(data, src, bytes);
+        for (int j = 0; j < expandRows; ++j) {
+          colDataAppend(pColInfoData, startRow+j, data, false);
+        }
+        //colDataAppendNItems(pColInfoData, startRow, data, expandRows);
+        taosMemoryFree(data);
       }
     }
 
diff --git a/tests/script/sh/compile_udf.sh b/tests/script/sh/compile_udf.sh
index c7148d7d7d5200fe12cb2af32172dfd6b1d9c68a..5265e5a99b3400ac93702d7ee8a972f5d2893b33 100755
--- a/tests/script/sh/compile_udf.sh
+++ b/tests/script/sh/compile_udf.sh
@@ -1,10 +1,11 @@
 set +e
 
-rm -rf /tmp/udf/libbitand.so /tmp/udf/libsqrsum.so
+rm -rf /tmp/udf/libbitand.so /tmp/udf/libsqrsum.so /tmp/udf/libgpd.so
 mkdir -p /tmp/udf
 echo "compile udf bit_and and sqr_sum"
 gcc -fPIC -shared sh/bit_and.c -I../../include/libs/function/ -I../../include/client -I../../include/util   -o /tmp/udf/libbitand.so
 gcc -fPIC -shared sh/l2norm.c -I../../include/libs/function/ -I../../include/client -I../../include/util   -o /tmp/udf/libl2norm.so
+gcc -fPIC -shared sh/gpd.c -I../../include/libs/function/ -I../../include/client -I../../include/util   -o /tmp/udf/libgpd.so
 echo "debug show /tmp/udf/*.so"
 ls /tmp/udf/*.so
 
diff --git a/tests/script/sh/gpd.c b/tests/script/sh/gpd.c
index 8d69bacb5edac29783ce860fb3a8dd5b407541d8..2259efa64a500cd7bf331642445c47a08883bec1 100644
--- a/tests/script/sh/gpd.c
+++ b/tests/script/sh/gpd.c
@@ -12,13 +12,10 @@
 TAOS* taos = NULL;
 
 DLL_EXPORT int32_t gpd_init() {
-  taos = taos_connect("localhost", "root", "taosdata", "", 7100);
   return 0;
 }
 
 DLL_EXPORT int32_t gpd_destroy() {
-  taos_close(taos);
-  taos_cleanup();
   return 0;
 }
 
@@ -32,43 +29,18 @@ DLL_EXPORT int32_t gpd(SUdfDataBlock* block, SUdfColumn *resultCol) {
   SUdfColumnData *resultData = &resultCol->colData;
   resultData->numOfRows = block->numOfRows;
   for (int32_t i = 0; i < resultData->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 = 88;
-      udfColDataSet(resultCol, i, (char *)&luckyNum, false);
-    }
+    int64_t* calc_ts = (int64_t*)udfColDataGetData(block->udfCols[0], i);
+    char* varTbname = udfColDataGetData(block->udfCols[1], i);
+    char* varDbname = udfColDataGetData(block->udfCols[2], i);
+
+    char dbName[256] = {0};
+    char tblName[256] = {0};      
+    memcpy(dbName, varDataVal(varDbname), varDataLen(varDbname));
+    memcpy(tblName, varDataVal(varTbname), varDataLen(varTbname));
+    printf("%s, %s\n", dbName, tblName);    
+    int32_t result = 0;
+    udfColDataSet(resultCol, i, (char*)&result, false);    
   }
-  TAOS_RES* res = taos_query(taos, "create database if not exists gpd");
-  if (taos_errno(res) != 0) {
-    char* errstr = taos_errstr(res);
-  } 
-  res = taos_query(taos, "create table gpd.st (ts timestamp, f int) tags(t int)");
-  if (taos_errno(res) != 0) {
-    char* errstr = taos_errstr(res);
-  } 
 
-  taos_query(taos, "insert into gpd.t using gpd.st tags(1) values(now, 1) ");
-  if (taos_errno(res) != 0) {
-    char* errstr = taos_errstr(res);
-  } 
-
-  taos_query(taos, "select * from gpd.t");
-  if (taos_errno(res) != 0) {
-    char* errstr = taos_errstr(res);
-  } 
-
-  //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
   return 0;
 }
diff --git a/tests/script/tsim/query/udf_with_const.sim b/tests/script/tsim/query/udf_with_const.sim
new file mode 100644
index 0000000000000000000000000000000000000000..7a2a3389bd155e1c384823ce94c3fdd96b14139e
--- /dev/null
+++ b/tests/script/tsim/query/udf_with_const.sim
@@ -0,0 +1,45 @@
+system_content printf %OS%
+if $system_content == Windows_NT then
+  return 0;
+endi
+
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c udf -v 1
+system sh/exec.sh -n dnode1 -s start
+sql connect
+
+print ======== step1 udf
+system sh/compile_udf.sh
+sql create database udf vgroups 3;
+sql use udf;
+
+sql create table t (ts timestamp, f int);
+sql insert into t values(now, 1)(now+1s, 2)(now+2s,3)(now+3s,4)(now+4s,5)(now+5s,6)(now+6s,7);
+
+system_content printf %OS%
+if $system_content == Windows_NT then
+  return 0;
+endi
+
+if $system_content == Windows_NT then
+  sql create function gpd as 'C:\\Windows\\Temp\\gpd.dll' outputtype int bufSize 8;
+else
+  sql create function gpd as '/tmp/udf/libgpd.so' outputtype int bufSize 8;
+endi
+sql show functions;
+if $rows != 1 then
+  return -1
+endi
+
+sql select gpd(ts, tbname, 'detail') from t;
+if $rows != 7 then
+  return -1
+endi
+print $data00 $data10
+if $data00 != @0@ then
+  return -1
+endi
+sql drop function gpd;
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT