[CP] [to #45843079] fix serval bugs found by external customers

src/observer/mysql/obmp_stmt_execute.cpp

@@ -2171,7 +2171,11 @@ int ObMPStmtExecute::parse_basic_param_value(ObIAllocator &allocator,
               if (is_oracle_mode() && !is_complex_element) {
                 param.set_char(dst);
               } else {
-                param.set_varchar(dst);
+                if (is_complex_element && dst.length()== 0) {
+                  param.set_null();
+                } else {
+                  param.set_varchar(dst);
+                }
               }
             }
           }

src/pl/ob_pl_resolver.cpp

@@ -7136,7 +7136,7 @@ int ObPLResolver::add_pl_integer_checker_expr(ObRawExprFactory &expr_factory,
   if (OB_SUCC(ret)) {
     // 对于溢出的检查只关心双目运算符的计算
     if (2 == expr->get_param_count() && !IS_COMMON_COMPARISON_OP(expr->get_expr_type())
-             && !LOGIC_EXPR(expr) && CHECK_RES_TYPE(expr)) {
+             && !LOGIC_EXPR(expr) && expr->get_expr_type() != T_FUN_SYS_POWER && CHECK_RES_TYPE(expr)) {
       const ObRawExpr *left = ObRawExprUtils::skip_implicit_cast(expr->get_param_expr(0));
       const ObRawExpr *right = ObRawExprUtils::skip_implicit_cast(expr->get_param_expr(1));
       ObPLIntegerType left_pl_integer = PL_INTEGER_INVALID, right_pl_integer = PL_INTEGER_INVALID;