diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 13f2eb161eb8007a4c1c00b911f59aa13f9d4668..693a1e6f3f707f8588328861e996831dcd7fd7d4 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -9590,7 +9590,7 @@ int32_t exprTreeFromSqlExpr(SSqlCmd* pCmd, tExprNode **pExpr, const tSqlExpr* pS
       SArray* paramList = pSqlExpr->Expr.paramList;
       size_t paramSize = paramList ? taosArrayGetSize(paramList) : 0;
       if (paramSize > 0) {
-        (*pExpr)->_func.numChildren = (uint8_t)paramSize;
+        (*pExpr)->_func.numChildren = (int32_t)paramSize;
         (*pExpr)->_func.pChildren = (tExprNode**)calloc(paramSize, sizeof(tExprNode*));
       }
       for (int32_t i = 0; i < paramSize; ++i) {
diff --git a/src/common/inc/texpr.h b/src/common/inc/texpr.h
index d7debbeecd3faf6247ac034575f39fcc2c483a69..0375e013843f43b4e4d644ad898594f903eca8f8 100644
--- a/src/common/inc/texpr.h
+++ b/src/common/inc/texpr.h
@@ -73,7 +73,7 @@ typedef struct {
   char* data;
 } tExprOperandInfo;
 
-typedef void (*_expr_scalar_function_t)(int16_t functionId, tExprOperandInfo* pInputs, uint8_t numInputs, tExprOperandInfo* pOutput, int32_t order);
+typedef void (*_expr_scalar_function_t)(int16_t functionId, tExprOperandInfo* pInputs, int32_t numInputs, tExprOperandInfo* pOutput, int32_t order);
 
 _expr_scalar_function_t getExprScalarFunction(uint16_t scalar);
 
@@ -126,7 +126,7 @@ typedef struct tExprNode {
 
     struct {
       int16_t functionId;
-      uint8_t numChildren;
+      int32_t numChildren;
       struct tExprNode **pChildren;
     } _func;
   };
diff --git a/src/common/src/texpr.c b/src/common/src/texpr.c
index 5a301dbbeafca8bd83ea51513ee7ffc4f5d43886..24ed08efdaaf3e8c3549ef79cfe6d252fb0d045c 100644
--- a/src/common/src/texpr.c
+++ b/src/common/src/texpr.c
@@ -321,7 +321,7 @@ void exprTreeInternalNodeTraverse(tExprNode *pExpr, int32_t numOfRows, tExprOper
 
 void exprTreeFunctionNodeTraverse(tExprNode *pExpr, int32_t numOfRows, tExprOperandInfo *output, void *param, int32_t order,
                                   char *(*getSourceDataBlock)(void *, const char*, int32_t)) {
-  uint8_t numChildren = pExpr->_func.numChildren;
+  int32_t numChildren = pExpr->_func.numChildren;
   if (numChildren == 0) {
     _expr_scalar_function_t scalarFn = getExprScalarFunction(pExpr->_func.functionId);
     output->type = pExpr->resultType;
@@ -526,7 +526,7 @@ static void exprTreeToBinaryImpl(SBufferWriter* bw, tExprNode* expr) {
     exprTreeToBinaryImpl(bw, expr->_node.pRight);
   } else if (expr->nodeType == TSQL_NODE_FUNC) {
     tbufWriteInt16(bw, expr->_func.functionId);
-    tbufWriteUint8(bw, expr->_func.numChildren);
+    tbufWriteInt32(bw, expr->_func.numChildren);
     for (int i = 0; i < expr->_func.numChildren; ++i) {
       exprTreeToBinaryImpl(bw, expr->_func.pChildren[i]);
     }
@@ -599,7 +599,7 @@ static tExprNode* exprTreeFromBinaryImpl(SBufferReader* br) {
     assert(pExpr->_node.pLeft != NULL && pExpr->_node.pRight != NULL);
   } else if (pExpr->nodeType == TSQL_NODE_FUNC) {
     pExpr->_func.functionId = tbufReadInt16(br);
-    pExpr->_func.numChildren = tbufReadUint8(br);
+    pExpr->_func.numChildren = tbufReadInt32(br);
     pExpr->_func.pChildren = (tExprNode**)calloc(pExpr->_func.numChildren, sizeof(tExprNode*));
     for (int i = 0; i < pExpr->_func.numChildren; ++i) {
       pExpr->_func.pChildren[i] = exprTreeFromBinaryImpl(br);
@@ -1040,7 +1040,7 @@ int32_t exprValidateMathNode(tExprNode *pExpr) {
   return TSDB_CODE_SUCCESS;
 }
 
-void vectorConcat(int16_t functionId, tExprOperandInfo* pInputs, uint8_t numInputs, tExprOperandInfo* pOutput, int32_t order) {
+void vectorConcat(int16_t functionId, tExprOperandInfo* pInputs, int32_t numInputs, tExprOperandInfo* pOutput, int32_t order) {
   assert(functionId == TSDB_FUNC_SCALAR_CONCAT && numInputs >=2 && order == TSDB_ORDER_ASC);
   for (int i = 0; i < numInputs; ++i) {
     assert(pInputs[i].numOfRows == 1 || pInputs[i].numOfRows == pOutput->numOfRows);
@@ -1080,7 +1080,7 @@ void vectorConcat(int16_t functionId, tExprOperandInfo* pInputs, uint8_t numInpu
   free(inputData);
 }
 
-void vectorLength(int16_t functionId, tExprOperandInfo *pInputs, uint8_t numInputs, tExprOperandInfo* pOutput, int32_t order) {
+void vectorLength(int16_t functionId, tExprOperandInfo *pInputs, int32_t numInputs, tExprOperandInfo* pOutput, int32_t order) {
   assert(functionId == TSDB_FUNC_SCALAR_LENGTH && numInputs == 1 && order == TSDB_ORDER_ASC);
 
   char* data0 = NULL;
@@ -1102,7 +1102,7 @@ void vectorLength(int16_t functionId, tExprOperandInfo *pInputs, uint8_t numInpu
   }
 }
 
-void vectorMathFunc(int16_t functionId, tExprOperandInfo *pInputs, uint8_t numInputs, tExprOperandInfo* pOutput, int32_t order)  {
+void vectorMathFunc(int16_t functionId, tExprOperandInfo *pInputs, int32_t numInputs, tExprOperandInfo* pOutput, int32_t order)  {
 
   for (int i = 0; i < numInputs; ++i) {
     assert(pInputs[i].numOfRows == 1 || pInputs[i].numOfRows == pOutput->numOfRows);