diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 64f56212af..0c38d43543 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1707,8 +1707,6 @@ void* tDecodeDataBlock(const void* buf, SSDataBlock* pBlock) {
 
     if (IS_VAR_DATA_TYPE(data.info.type)) {
       buf = taosDecodeBinary(buf, (void**)&data.varmeta.offset, pBlock->info.rows * sizeof(int32_t));
-      data.varmeta.length = pBlock->info.rows * sizeof(int32_t);
-      data.varmeta.allocLen = data.varmeta.length;
     } else {
       buf = taosDecodeBinary(buf, (void**)&data.nullbitmap, BitmapLen(pBlock->info.rows));
     }
@@ -1716,6 +1714,10 @@ void* tDecodeDataBlock(const void* buf, SSDataBlock* pBlock) {
     int32_t len = 0;
     buf = taosDecodeFixedI32(buf, &len);
     buf = taosDecodeBinary(buf, (void**)&data.pData, len);
+    if (IS_VAR_DATA_TYPE(data.info.type)) {
+      data.varmeta.length = len;
+      data.varmeta.allocLen = len;
+    }
     taosArrayPush(pBlock->pDataBlock, &data);
   }
   return (void*)buf;
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index f8c4f171ba..088aa62248 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -888,10 +888,11 @@ static int32_t udfdUvInit() {
   }
   global.loop = loop;
 
-  uv_pipe_init(global.loop, &global.ctrlPipe, 1);
-  uv_pipe_open(&global.ctrlPipe, 0);
-  uv_read_start((uv_stream_t *)&global.ctrlPipe, udfdCtrlAllocBufCb, udfdCtrlReadCb);
-
+  if (tsStartUdfd) { // udfd is started by taosd, which shall exit when taosd exit
+    uv_pipe_init(global.loop, &global.ctrlPipe, 1);
+    uv_pipe_open(&global.ctrlPipe, 0);
+    uv_read_start((uv_stream_t *)&global.ctrlPipe, udfdCtrlAllocBufCb, udfdCtrlReadCb);
+  }
   getUdfdPipeName(global.listenPipeName, sizeof(global.listenPipeName));
 
   removeListeningPipe();
@@ -979,13 +980,13 @@ int32_t udfdDeinitResidentFuncs() {
     char* funcName = taosArrayGet(global.residentFuncs, i);
     SUdf** udfInHash =  taosHashGet(global.udfsHash, funcName, strlen(funcName));
     if (udfInHash) {
-      taosHashRemove(global.udfsHash, funcName, strlen(funcName));
       SUdf* udf = *udfInHash;
       if (udf->destroyFunc) {
         (udf->destroyFunc)();
       }
       uv_dlclose(&udf->lib);
       taosMemoryFree(udf);
+      taosHashRemove(global.udfsHash, funcName, strlen(funcName));
     }
   }
   taosArrayDestroy(global.residentFuncs);
diff --git a/source/libs/scalar/src/scalar.c b/source/libs/scalar/src/scalar.c
index 7c59c70f30..70d1bb2685 100644
--- a/source/libs/scalar/src/scalar.c
+++ b/source/libs/scalar/src/scalar.c
@@ -1085,7 +1085,8 @@ EDealRes sclRewriteNonConstOperator(SNode **pNode, SScalarCtx *ctx) {
 EDealRes sclRewriteFunction(SNode **pNode, SScalarCtx *ctx) {
   SFunctionNode *node = (SFunctionNode *)*pNode;
   SNode         *tnode = NULL;
-  if (!fmIsScalarFunc(node->funcId) && (!ctx->dual)) {
+  if ((!fmIsScalarFunc(node->funcId) && (!ctx->dual)) ||
+      fmIsUserDefinedFunc(node->funcId)) {
     return DEAL_RES_CONTINUE;
   }