set sql expr type when no children for function for sql like select first(c6)...

set sql expr type when no children for function for sql like select first(c6) - last(c6) *12 / count(*) from ca_db0.ca_stb0 group by c5

src/client/src/tscSQLParser.c

@@ -4403,6 +4403,12 @@ static int32_t validateSQLExprItemSQLFunc(SSqlCmd* pCmd, tSqlExpr* pExpr,
     }
     free(childrenTypes);
 
+  } else {
+    if (TSDB_FUNC_IS_SCALAR(functionId)) {
+      *type = SQLEXPR_TYPE_SCALAR;
+    } else {
+      *type = SQLEXPR_TYPE_AGG;
+    }
   }
 
   if (!TSDB_FUNC_IS_SCALAR(functionId)) {