fix build error : no paramList when first(*) and support udf in expr

src/client/src/tscSQLParser.c

@@ -4336,9 +4336,6 @@ static int32_t validateSQLExprSQLFunc(SSqlCmd* pCmd, tSqlExpr* pExpr,
                                          SQueryInfo* pQueryInfo, SColumnList* pList, int32_t* type, uint64_t *uid) {
   int32_t code = TSDB_CODE_SUCCESS;
   int32_t functionId = isValidFunction(pExpr->Expr.operand.z, pExpr->Expr.operand.n);
-  if (functionId < 0) {
-    return TSDB_CODE_TSC_INVALID_OPERATION;
-  }
   if (*type == NON_ARITHMEIC_EXPR) {
     if (TSDB_FUNC_IS_SCALAR(functionId)) {
       *type = NORMAL_ARITHMETIC;
@@ -4352,9 +4349,10 @@ static int32_t validateSQLExprSQLFunc(SSqlCmd* pCmd, tSqlExpr* pExpr,
   }
 
   pExpr->functionId = functionId;
-  size_t numChilds = taosArrayGetSize(pExpr->Expr.paramList);
-  for (int i = 0; i < numChilds; ++i) {
-    tSqlExprItem* pParamElem= taosArrayGet(pExpr->Expr.paramList, i);
+  if (pExpr->Expr.paramList != NULL) {
+    size_t numChildren = taosArrayGetSize(pExpr->Expr.paramList);
+    for (int32_t i = 0; i < numChildren; ++i) {
+      tSqlExprItem* pParamElem = taosArrayGet(pExpr->Expr.paramList, i);
       if (!TSDB_FUNC_IS_SCALAR(functionId) &&
           (pParamElem->pNode->type == SQL_NODE_EXPR || pParamElem->pNode->type == SQL_NODE_SQLFUNCTION)) {
         return TSDB_CODE_TSC_INVALID_OPERATION;
@@ -4364,14 +4362,19 @@ static int32_t validateSQLExprSQLFunc(SSqlCmd* pCmd, tSqlExpr* pExpr,
         return code;
       }
     }
+  }
 
   if (!TSDB_FUNC_IS_SCALAR(functionId)) {
-    for (int i = 0; i < numChilds; ++i) {
+    if (pExpr->Expr.paramList != NULL)
+    {
+      size_t numChildren = taosArrayGetSize(pExpr->Expr.paramList);
+      for (int32_t i = 0; i < numChildren; ++i) {
         tSqlExprItem* pParamElem = taosArrayGet(pExpr->Expr.paramList, i);
         if (pParamElem->pNode->type == SQL_NODE_EXPR || pParamElem->pNode->type == SQL_NODE_SQLFUNCTION) {
           return TSDB_CODE_TSC_INVALID_OPERATION;
         }
       }
+    }
 
 
     int32_t outputIndex = (int32_t)tscNumOfExprs(pQueryInfo);